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OGC OWS Context GeoJSON Encoding Standard (version 1.0) — OGC 14-055r2

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Open Geospatial Consortium Submission Date: 2016-05-30 Approval Date: 2016-11-02 Publication Date: 2017-04-06 External identifier of this OGC® document: <http://www.opengis.net/doc/IS/ows-context-geojson/1.0> Internal reference number of this OGC® document:

14-055r2

Version: 1.0 Category: OGC® Implementation Standard Editors: Pedro Gonçalves, Roger Brackin

OGC OWS Context GeoJSON Encoding Standard

Warning This document is an OGC Member approved international standard. This document is available on a royalty free, non-discriminatory basis. Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.

Document type: Document subtype: Document stage: Document language:

OGC® Standard Encoding Approved English

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Contents 1.

Scope ............................................................................................................................ 7

Conformance ................................................................................................................ 7

References .................................................................................................................... 8

Terms and Definitions.................................................................................................. 9

Conventions ................................................................................................................. 9 5.1 Abbreviated Terms.................................................................................................... 9 5.1

Data dictionary tables .......................................................................................... 10

Overview .................................................................................................................... 10 6.1

JavaScript Object Notation .................................................................................. 11

6.2

GeoJSON Format Specification........................................................................... 11

GeoJSON Encoding Specification ............................................................................. 12 7.1

OWS Core Context GeoJSON Encoding............................................................. 12

7.1.1

Class OWC:Context ...................................................................................... 12

7.1.2

Class OWC:Resource.................................................................................... 22

7.1.3

DataType OWC:Offering.............................................................................. 35

7.1.4

DataType OWC:Operation ........................................................................... 38

7.1.5

DataType OWC:Content ............................................................................... 46

7.1.6

DataType OWC:StyleSet .............................................................................. 48

7.1.7

DataType OWC:Creator ............................................................................... 54

7.1.8

DataType OWC:Creator/OWC:CreatorApplication ..................................... 54

7.1.9

DataType OWC:Creator/OWC:CreatorDisplay ........................................... 56

7.1.10

DataType links ............................................................................................ 58

7.2

GeoJSON WMS Offering .................................................................................... 59

7.3

GeoJSON WFS Offering ..................................................................................... 59

7.4

GeoJSON WCS Offering ..................................................................................... 60

7.5

GeoJSON WPS Offering ..................................................................................... 60

7.6

GeoJSON CSW Offering ..................................................................................... 60

7.7

GeoJSON WMTS Offering.................................................................................. 61

7.8

GeoJSON GML Offering..................................................................................... 61

7.9

GeoJSON KML Offering..................................................................................... 61

7.10

GeoJSON GeoTIFF Offering............................................................................. 62

7.11

GeoJSON GMLJP2 Offering ............................................................................. 62

7.12

GeoJSON GMLCOV Offering .......................................................................... 62

Media Types for any data encoding(s)....................................................................... 63 A.1 Conformance Test Class: core ............................................................................ 64 A.2 Conformance Test Class: wms ............................................................................ 65 A.3 Conformance Test Class: wfs ............................................................................. 65 A.4 Conformance Test Class: wcs ............................................................................. 66 A.5 Conformance Test Class: wps ............................................................................. 66 A.6 Conformance Test Class: csw ............................................................................. 66 A.7 Conformance Test Class: wmts........................................................................... 66 A.8 Conformance Test Class: gml ............................................................................. 67 A.9 Conformance Test Class: kml ............................................................................. 67 A.10 Conformance Test Class: geotiff....................................................................... 67 A.11 Conformance Test Class: gmljp2 ...................................................................... 67 A.12 Conformance Test Class: gmlcov ..................................................................... 68 A.1 wmts.json ............................................................................................................ 69

Abstract This standard describes the GeoJSON encoding of the OGC Web Services (OWS) Context conceptual model. This standard defines how to encode an OWS context document that 1.) can be extended to allow a context referencing a fully configured service set, and 2.) can be defined and consistently interpreted by clients. The OWS Context Document standard (OWS Context) was created to allow a set of configured information resources to be passed between applications primarily as a collection of services (but also potentially in-line content). The objective is to support use cases such as the distribution of search results, the exchange of a set of resources in a Common Operating Picture (COP), or delivery of a set of configured processing services to allow the processing to be reproduced on different processing nodes. The goal for OWS Context is to replace previous OGC standards and best practices that provide similar capability. Web Map Context (WMC) has been reasonably successful but is limited to working with only Web Map Service (WMS) instances. Other work on the Location Organizer Folder1 (LOF) was also taken into consideration. The concept of OWS Context and the first prototype document was produced as part of OWS Testbed 7 and documented in [OGC10-035r1], Information Sharing Engineering Report. A principal goal of the OWS Context SWG was to develop encodings that would appeal for use in mass market applications yet also provide facilities for more advanced uses. OWS-7 originally considered the application of existing encoding standards for OWS Context. The OGC Standards Working Group (SWG) has concluded that this standard can have multiple encoding formats and that each encoding format will be described in a separate OGC Extension to the Core model. An additional goal is that transformations of context documents between the different encodings should be lossless. GeoJSON2 is a format for encoding collections of simple geographical features along with their non-spatial attributes using JSON. GeoJSON objects may represent a geometry, a feature, or a collection of features. GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a geometry object and additional properties, and a feature collection represents a list of features. This document concentrates on the GeoJSON encoding of the OWS Context Model as described in abstract terms in OGC 12-080r2 OGC OWS Context Conceptual Model ( OGC 12-080r2). The goal of OWS Context is to allow many types of OGC data delivery services to be referenced and therefore exploited - not just OGC Web Map Service but 1

http://portal.opengeospatial.org/files/?artifact_id=1042

GeoJSON is a draft international standard (see Ref 14) RFC7946. As such referencing it normatively is valid within an OGC Standard

other OGC web services and content specifications, including but not limited to Web Feature Service, Web Coverage Service, Web Processing Service, GML, GeoTIFF and KML. This document does not explicitly define the encoding of these services and data encodings in the core, only the general approach to be used for different types of service and data interface.

ii.

Keywords The following are keywords to be used by search engines and document catalogues. ogcdoc, ogc documents, COP, Common Operating Picture, OWC, Context, JSON, GeoJSON

iii.

Preface Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for identifying any or all such patent rights. Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.

iv.

Submitting organizations The following organizations submitted this Document to the Open Geospatial Consortium (OGC): • • • • • • •

Envitia Ltd Esri Inc. ImageMatters LLC NGA Terradue Srl. Universitat Autònoma de Barcelona-CREAF USGS

Submitters All questions regarding this submission should be directed to the editor or the submitters: Name

Affiliation

Pedro Gonçalves

Terradue Srl

Roger Brackin

Envitia Ltd

Glenn Guempel

Marten Hogeweg

Esri Inc

Joan Maso

Universitat Autònoma de Barcelona-CREAF

David Wesloh

NGA

Jeff Yutzler

Image Matters LLC

1. Scope This document specifies how applications supporting the OWS Context GeoJSON encoding can exchange information context with other supporting applications in compliance with the OWS Context Conceptual Model.

2. Conformance This standard defines a standardization target for encoding an OWS Context Document. It establishes requirements classes for the ‘core’ and then for a series of offering extensions, relating to services or content. The URIs are as follows: • • • • • • • • • • • •

Core: http://www.opengis.net/spec/owc-geojson/1.0/req/core WMS: http://www.opengis.net/spec/owc-geojson/1.0/req/wms WFS: http://www.opengis.net/spec/owc-geojson/1.0/req/wfs WCS: http://www.opengis.net/spec/owc-geojson/1.0/req/wcs WPS: http://www.opengis.net/spec/owc-geojson/1.0/req/wps WMTS: http://www.opengis.net/spec/owc-geojson/1.0/req/wmts CSW: http://www.opengis.net/spec/owc-geojson/1.0/req/csw GML: http://www.opengis.net/spec/owc-geojson/1.0/req/gml KML: http://www.opengis.net/spec/owc-geojson/1.0/req/kml GeoTIFF: http://www.opengis.net/spec/owc-geojson/1.0/req/geotiff GMLJP2: http://www.opengis.net/spec/owc-geojson/1.0/req/gmljp2 GMLCOV: http://www.opengis.net/spec/owc-geojson/1.0/req/gmlcov

Requirements and conformance test URIs defined in this document are relative to the base URL http://www.opengis.net/spec/owc-geojson/1.0. Conformance with this standard shall be checked using all the relevant tests specified in Annex A (normative) of this document. The framework, concepts, and methodology for testing, and the criteria to be achieved to claim conformance are specified in the OGC Compliance Testing Policies and Procedures and the OGC Compliance Testing web site3.

www.opengeospatial.org/cite

Requirements for two standardization target types are considered: 1. An OWS Context Document Encoded in GeoJSON; and 2. The interpretation of an OWS Context Document by a client (Requirements and abstract tests for this are not included in this release of the document). In order to conform to this OGC® interface standard, a software implementation shall implement: 1. Conformance to the ‘Core GeoJSON’ encoding; and 2. Conformance with zero or more of the offering-specific extensions. All requirements-classes and conformance-classes described in this document are owned by the standard identified as OWS Context [OGC 14-055].

3. References The following normative documents contain provisions that, through reference in this text, constitute provisions of this document. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies. 3.1 Normative References 1. OGC: [OGC 12-080] - OWS Context Conceptual Model, 2014 2. ECMA: [ECMA-262] - ECMA International, "ECMAScript Language Specification, Edition 5.1", Standard ECMA-262, June 2011, http://www.ecmainternational.org/publications/standards/Ecma-262.htm, 2011 3. ECMA: [ECMA-404] - The JSON Data Interchange Format http://www.ecmainternational.org/publications/files/ECMA-ST/ECMA-404.pdf, 2013 4. ISO: [ISO-8601] - Data elements and interchange formats — Information interchange Representation of dates and times, Third edition, 2004 5. OGC: [OGC 05-077r4] - OGC Symbology Encoding Implementation Specification, 2006 6. OGC: [OGC 06-042] - OGC Web Map Service (WMS) Implementation Specification, 2006 7. OGC: [OGC 06-121r9] - OGC Web Service Common Implementation Specification, 2010 8. OGC: [OGC 07-036] - OGC Geography Markup Language (GML) Encoding Standard, 2007 9. IETF: [RFC-3339] - Date and Time on the Internet: Timestamps, 2002 10. IETF: [RFC-3986] - Uniform Resource Identifier (URI): Generic Syntax, 2005 11. IETF: [RFC-3987] - Internationalized Resource Identifiers (IRIs), 2005 12. IETF: [RFC-7159] - The JavaScript Object Notation (JSON) Data Interchange Format, 2014 8 Copyright © 2017 Open Geospatial Consortium

13. W3C: [XML 1.0] - Extensible Markup Language (XML) 1.0 (Third Edition) http://www.w3.org/TR/2004/REC-xml-20040204/, 2004 14. IETF: [RFC-7946] - The GeoJSON Format, 2016

4. Terms and Definitions This document uses the terms defined in Sub-clause 5.3 of [OGC 06-121r94], which is based on the ISO/IEC Directives, Part 2, Rules for the structure and drafting of International Standards. In particular, the word “shall” (not “must”) is the verb form used to indicate a requirement to be strictly followed to conform to this standard. For the purposes of this document, the following additional terms and definitions apply. 4.1 Area Of Interest An Area Of Interest is a geographic area that is significant to a user. 4.2 Common Operating Picture A single identical display of relevant information shared by more than one user group. A common operational picture facilitates collaborative planning and assists all user groups to achieve situational awareness. 4.3 Context Document A Context Document is a document describing the set of services and their configuration, and ancillary information, such as the area of interest, which defines the information representation of a shared view or data collection. 4.4 Resource A resource is a configured set of information that is uniquely identifiable to a user. Can be realized as in-line content or by one or more configured web services.

5. Conventions This section provides details and examples for any conventions used in the document. Examples of conventions are symbols, abbreviations, use of XML schema, or special notes regarding how to read the document. 5.1 Abbreviated Terms CSW – Catalogue Services for the Web CRS – Coordinate Reference System GML – Geographical Markup Language GMLCOV - GML Coverage 4

http://portal.opengeospatial.org/files/?artifact_id=38867

GMLJP2 - GML in JPEG 2000 for Geographic Imagery HTML - Hypertext Markup Language HTTP - Hypertext Transfer Protocol IETF - Internet Engineering Task Force IRI - Internationalized Resource Identifier ISO - International Organization for Standardization JSON - JavaScript Object Notation KML - Keyhole Markup Language MIME - Multipurpose Internet Mail Extensions OGC - Open Geospatial Consortium OWC - OGC Web Services Context OWS - OGC Web Services RFC - Request for Comments UML - Unified Modeling Language URI - Uniform Resource Identifier URL - Uniform Resource Locator WCS - Web Coverage Service WFS - Web Feature Service WMS - Web Map Service WMTS - Web Map Tile Service WPS - Web Processing Service XHTML - Extensible Hypertext Markup Language XML - Extensible Markup Language 5.1 Data dictionary tables This document includes data dictionary tables related to the UML model specified in [OGC 12-080 OWS Context Conceptual Model]. The contents of the columns in these tables are described in sub-clause 5.5 of [OGC 06-121r9]. The contents of these data dictionary tables are normative, including any table footnotes.

6. Overview This clause specifies the links from the encoding to the underlying OWS Context data model. This clause defines a mapping for all classes and attributes of the OWS Conceptual model. This includes mandatory requirements for the encoding of a context document and the necessary semantics of how that encoding should be interpreted. The conceptual model on which this encoding is based is divided into various packages. These are shown in Figure 1. Note that these packages map directly to requirement classes.

Figure 1 - OWS Context Standard Packages

6.1 JavaScript Object Notation JavaScript Object Notation (JSON) is a lightweight, text-based, language-independent data interchange format that defines a small set of formatting rules for the portable representation of structured data. JSON is derived from the object literals of JavaScript, as defined in the ECMAScript Programming Language Standard [ECMA-262] and can represent four primitive types (strings, numbers, boolean values, and null) and two structured types (objects and arrays). Even though JSON is based on a subset of the JavaScript Programming Language it is currently well supported by nearly all programming languages, including Java, Python, and C#. The JSON format is currently described by two competing standards, [RFC7159] and [ECMA-404]. Both standards documents are consistent, but the latter defines mainly the grammatical syntax where the former provides some additional semantic and security points. 6.2 GeoJSON Format Specification GeoJSON is a format for encoding collections of simple geographical features along with their non-spatial attributes using JSON. GeoJSON consists of a single object representing a geometry, feature, or collection of features. The geometries supported include Point, MultiPoint, LineString, MultiLineString, Polygon, MultiPolygon and Geometry Collections. GeoJSON was originally defined in 2008 by [GeoJSON] and since 2014 there is an activity to define GeoJSON as an IETF RFC (standards track) [IETF GeoJSON]. The document has now reached the status of Draft RFC 7946. The IETF draft provides additional clarity regarding coordinate order and CRS and complies with the OGC Axis Order Policy Guidance.

7. GeoJSON Encoding Specification This clause specifies the links from the encoding to the underlying OWS Context data model. This clause defines a mapping for all classes and attributes of the OWS Conceptual model. This includes mandatory requirements for the encoding of a context document and the necessary semantics of how that encoding should be interpreted. The conceptual model on which this encoding is based is divided into various packages. Note that these packages map directly to requirement classes. 7.1 OWS Core Context GeoJSON Encoding The GeoJSON object is used in the OWS Context to describe the context document. Requirements Class http://www.opengis.net/spec/owc-geojson/1.0/req/core

Target type Dependency Requirement

Token http://www.opengis.net/spec/owc/1.0/core http://www.opengis.net/spec/owc-geojson/1.0/req/geojsonRules

An OWS Context document encoded in GeoJSON (GeoJSON Context Document) SHALL comply with the rules specified in [IETF GeoJSON] Requirement

http://www.opengis.net/spec/owc-geojson/1.0/req/mime-type

GeoJSON OWS Context documents SHALL adopt the GeoJSON MIMEtype application/vnd.geo+json Requirement

http://www.opengis.net/spec/owc-geojson/1.0/req/file-extension

GeoJSON OWS Context documents using GeoJSON SHALL use the file extension of ‘.geojson’ or ‘.json’ Requirement

http://www.opengis.net/spec/owc-geojson/1.0/req/owc-encoding

GeoJSON encoded OWS Context documents SHALL comply with the encoding rules given in the section 7.1.1. 7.1.1 Class OWC:Context The OWC:Context Class is mapped to a GeoJSON Feature Collection object. The mapping of the OWC:Context Class in the geojson object is shown in Table 1. Table 1 — OWC:Context mapping to geojson Names: Conceptual GeoJSON mapping

Definition

Data type and value

Type of geojson object

String type that SHALL have the value “FeatureCollection”

a,d

<xz>.type

Multiplicity and use One (mandatory)

Names: Conceptual GeoJSON mapping

Data type and value

Specification Reference (requirements class) identifying that this is an OWC Context document and its version

Array of links profiles (as defined in Table 10 where one element SHALL have the href value “http://www.opengis.n et/spec/owcgeojson/1.0/req/core” in this version String type, not empty with an RFC-3066 code

One (mandatory)

Unambiguous reference to the identification of the Context document (IRI) Title for the Context document

String type that SHALL contain a URI value

One b (mandatory)

String type, not empty

One (mandatory)

Description of the Context document purpose or content

String type, not empty

Zero or one (optional)

Date of a creation or update of the Context document

RFC-3339 date e

One (mandatory)

Entity primarily responsible for making the Context document

String type, not empty

Zero or more (optional) c

Identifier for the publisher of the Context document

String type, not empty

Zero or one (optional)

Tool/application used to create the Context document and its properties

OWC:Creator (as defined in Table 7)

Zero or one (optional)

Information about rights held in and over the Context document

String type, not empty

Zero or one (optional)

Geographic Area of interest of the users of the Context document according to the GeoJSON “bbox” definition

Double type

Zero or 2*n (n is the number of dimensions) (optional)

a,d

specReference <xz>.properties. links.profiles

Language <xz>.properties. lang

Id <xz>.id

Title <xz>.properties. title

Abstract <xz>.properties. subtitle

updateDate <xz>.properties. updated

author <xz>.properties. authors.name

Publisher <xz>.properties. publisher

creator <xz>.properties. generator

Multiplicity and use

Definition

Language of Context document content

One (mandatory)

<xz>.properties. display

rights <xz>.properties. rights

areaOfInterest <xz>.bbox

Names: Conceptual GeoJSON mapping

Data type and value

Date or range of dates relevant to the resource Category related to this context document. It MAY have a related code-list that is identified by the scheme attribute Resources available on the Context document

String representing a date according to the ISO-8601f format String type, not empty

Zero or one (optional)

Features array element as defined in Section 7.1.2 Array of links via (as defined in Table 10)

Zero or more (optional)

Any (outside of the scope of OWS Context)

Zero or more (optional)

a,d

timeIntervalOfInterest <xz>.date

Keyword <xz>.properties. categories.term

resource <xz>.features

contextMetadata <xz>.properties. links.via

Extension

Multiplicity and use

Definition

Reference to a resource from which the present resource is derived (e.g. source of the information) Any other element

<xz>.*

Zero or more (optional)

This specification assigns no significance to the order of appearance of the child elements of geojson object with the exception of member of the features array (the actual Resources). The order of the member of the features MAY be used to identify the drawing order of the resources. In that case, the first item of the array represents the top most layer (see section 7.1.1.13 for further details). b URIs used as identifiers should be in canonical form, as described by section 6 of RFC-3986. Avoid the use of URI like http://server.com/path that should be written as http://server.com/path/ c geojson objects MUST contain one or more elements on the properties.author array, unless all of the entries of the features array contain one or more elements on the properties.authors array. d <xz> is the name of the geojson object that depends on the implementation e RFC 3339 defines a profile of ISO 8601 for use in Internet protocols and standards. It explicitly excludes durations and dates before the common era. The more complex formats such as week numbers and ordinal days are not permitted. https://www.ietf.org/rfc/rfc3339.txt f

See http://www.iso.org/iso/home/standards/iso8601.htm

7.1.1.1 specReference Path: <xz>.properties.links.profiles[] The value of this element is the OGC standard reference (requirements class) identifying that this is an OWC Context document and its version. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/",

"properties" : { "links" : { "profiles" : [ "http://www.opengis.net/spec/owc-geojson/1.0/req/core" ], ... }, "features": [{ ... }] }

7.1.1.2 language Path: <xz>.properties.lang A GeoJSON Context object SHALL have a lang element. The format and interpretation of this value must follow the same rules as specified in [XML 1.0 W3C.REC], Section 2.12. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "lang" : "en", .... }, "features": [{ ... }] }

7.1.1.3 id Path: <xz>.id The id element defines a mandatory reference to the identification of the Context document. The content for the id element SHALL be an IRI, as defined by IETF [RFC3987]. By defining the id element as an "IRI" the use of relative references is excluded and thus the id element SHALL NOT be assumed to convey dereferenceable information. The content of this element SHALL be created in a way that assures uniqueness and follows the recommendations of IETF [RFC-4287] section 4.2.6. The id should be in canonical form, i.e. including the trailing ‘/’ (so avoiding the use of URI like http://server.com/path and using http://server.com/path/ instead). {

"type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", .... "features": [{ ... }] }

7.1.1.4 title Path: <xz>.properties.title This element contains the title of the Context document. This element is mandatory and SHOULD convey a human-readable title. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", .... }, "features": [{ ... }] }

7.1.1.5 abstract Path: <xz>.properties.subtitle This element is optional and contains the description of the Context Document’s purpose or content. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", "subtitle" : "This Context document uses WMS and GML", .... }, "features": [{ ... }] }

7.1.1.6 updateDate Path: <xz>.properties.updated This element is mandatory and indicates the most recent instant in time when the feed was modified in a way the publisher considers significant and does not necessarily account for minor modifications. The content of this element SHALL conform to the "date-time" production in IETF [RFC-3339]. In addition, an uppercase "T" character SHALL be used to separate date and time, and an uppercase "Z" character SHALL be present in the absence of a numeric time zone offset. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", "updated" : "2012-11-04T17:26:23Z", .... }, "features": [{ ... }] }

7.1.1.7 author Path: <xz>.properties.authors This element is optional and indicates the authors array of the Context document. This element MAY contain name (conveys a human-readable name for the person), email (email address for the person) and uri (home page for the person) elements. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", "authors" : [{ "name" : "Joe Doe”, "email" : "[email protected]", "uri" : "http://some.com/jdoe" }] .... }, "features": [{ ... }] }

7.1.1.8 publisher Path: <xz>.properties.publisher This element is optional and describes the entity responsible for making the Context document available. Examples of a Publisher include a person, an organization, or a service. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", "publisher" : "ACME Inc.”, .... }, "features": [{ ... }] }

7.1.1.9 creator Path: <xz>.properties.creator The element is optional and expresses the entity or agent (e.g. software) responsible for making the Context document. Example: { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "title" : "OWS Context GeoJSON Example", "creator" : "ACME CSW Server”, .... }, "features": [{ ... }] }

7.1.1.10 rights Path: <xz>properties.rights This element is optional and contains information about rights held in and over the Context document. Please note that this element SHALL NOT be used to convey machine-readable licensing information. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "rights" : "ACME Srl, licensed under a Creative Commons Attribution 3.0 License", .... }, "features": [{ ... }] }

7.1.1.11 areaOfInterest Path: <xz>.bbox This element is optional and expresses the geographic area of interest Context document using the GeoJSON “bbox” object. The value of the bbox member SHALL be a 2*n array where n is the number of dimensions represented in the contained geometries, with the lowest values for all axes followed by the highest values. The axes order of a bbox follows the axes order of geometries. In addition, the coordinate reference system for the bbox is assumed to match the coordinate reference system of the GeoJSON object of which it is a member [IETF GeoJSON]. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { .... }, "bbox": [100.0, 0.0, 105.0, 1.0], "features": [{ ... }] }

This element is optional and expressed a date or range of dates relevant to the Context document. It can contain the element start, stop and instant. The values of these elements SHALL conform to the "date-time" production of ISO-86015. An uppercase "T" character SHALL be used to separate date and time, and an uppercase "Z" character SHALL be present in the absence of a numeric time zone offset. To specify a range of dates the "/" character SHALL be used. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { "date": "2012-11-04T00:01:23Z/2012-12-05T17:28:56Z" .... }, "features": [{ ... }] }

7.1.1.13 resource Path: <xz>.features The resources of a Context document are mapped by the array elements described below in section 7.1.2. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { .... }, "features": [{ ... }] }

Note: This standard identifies the order of the features array element in relation to interpretation of the context document contents. Elements are ordered from highest importance to lowest in the file. In particular in relation to visualization geographically, the first entry in the GeoJSON document is the topmost layer in the display. 5

Note [ISO 8601] time type is used here as this property can contain a point time value or an interval. [IETF 3339] does not support intervals.

7.1.1.14 contextMetadata Path: <xz>.properties.links.via This element is optional and references an external resource from which the Context document is derived (e.g. metadata document from which the metadata of the resource is derived). The via element is an array of link objects that contains four elements named type, href, title and lang. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ..., "links" : { "via" : [{ "href" : "http://www.acme.com/collections/algal.xml", "type" : "application/xml ", "title" : "Algal XML metadata", "lang" : "en" }] .... }, "features": [{ ... }] }

7.1.1.15 keyword Path: <xz>.properties.categories This array is an optional and expresses categories related to this Context document. Keyword MAY have a related code-list that is identified by the scheme attribute. Each item of the category array has one required element, term (identifies the category), and two optional elements, scheme (identifies the categorization scheme via a URI) and label (provides a human-readable label for display). This standard assigns no significance to the order of items in the array. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... "categories" : [{ "scheme" : "http://www.acme.com/category", "term" : "oceansec", "label" : "Ocean Integrated Maritime Security"

}] ... }, "features": [{ ... }] }

7.1.1.16 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 1. 7.1.2 Class OWC:Resource The list of OWC: Resource Class is mapped to an array of GeoJSON Feature objects. The mapping of the OWC:Resource Class in shown in the table below. Table 2 - OWC:Resource mapping to feature element entry Names: Conceptual GeoJSON mapping a,e

Definition

Data type and values

Multiplicity and use

<xz>.features[i]. type

Type of geojson object

String type that SHALL have the value “Feature”

One (mandatory)

Unambiguous reference to the identification of the Context resource (IRI) Title given to the Context resource

String type that SHALL contain a URI value String type, not empty

One (mandatory)

Account of the content of the Context resource. The purpose is to provide a generic description of the content in a format understandable by generic readers Date of the last update of the Context resource

String type, not empty

Zero or one (optional)

String type representing a date according to the RFC-3339 date format String type, not empty

One (mandatory)

String type, not empty

Zero or one (optional)

<xz>.features[i]. id

Title <xz>.features[i]. properties.title

abstract <xz>.features[i]. properties. abstract

updateDate <xz>.features[i]. properties. updated

author <xz>.features[i]. properties. authors.name

publisher <xz>.features[i]. properties. publisher

Entity primarily responsible for making the content of the Context resource Entity responsible for making the Context resource available

One (mandatory)

Zero or more (optional) b

Names: Conceptual GeoJSON mapping a,e rights <xz>.features[i]. properties. rights

geospatialExtent <xz>.features[i]. geometry

temporalExtent <xz>.features[i]. properties.date

contentDescription <xz>.features[i]. properties.links .alternates

Preview <xz>.features[i]. properties.links .previews

contentByRef <xz>.features[i]. properties.links .data

Offering <xz>.features[i]. properties. offering

Active <xz>.features[i]. properties. active

resourceMetadata <xz>.features[i]. properties.links .via

Keyword <xz>.features[i]. properties. categories.term

minScale Denominator <xz>.features[i]. properties. minscaledenomina tor

Data type and values

Definition

Multiplicity and use

Information about rights held in and over the Context resource

String type, not empty

Zero or one (optional)

Spatial extent or scope of the content of the Context resource Date or range of dates relevant to the Context resource

GeoJSON geometry object

Zero or one (optional)

String representing a date or an interval according to the ISO-8601 format Array of link objects (as defined in Table 10)

Zero or one (optional)

Array of link objects (as defined in Table 10). The elements length SHOULD be provided Array of link objects (as defined in Table 10) d

Zero or more (optional)

owc:OfferingType, see Table 3

Zero or more (optional)

Boolean Possible values are 'true' or 'false'. Default value is ‘true’ Link object (as defined in Table 10)

Zero or one (optional)

String type, not empty

Zero or more (optional)

Double

Zero or one (optional)

Reference to a description of the Context resource in alternative format Reference to a quick-look or browse image representing the Context resource Reference to the location of the data resource described in the Context resource Service or inline content offering for the resource targeted at OGC compliant clients Flag value indicating to the client if the Context resource should be displayed by default Reference to a resource from which the Context resource is derived (e.g. source of the information) Category related to this resource. It MAY have a related code-list that is identified by the scheme attribute Minimum scale for the display of the Context resource

Zero or more (optional) c

Zero or more (optional)

Zero or more (optional) e

Names: Conceptual GeoJSON mapping a,e maxScaleDenominat or <xz>.features[i]. properties.maxsc aledenominator

folder <xz>.features[i]. properties.folde r

extension

Data type and values

Definition

Multiplicity and use

Maximum scale for the display of the Context resource

Double

Zero or one (optional)

Definition of the folder in which the resource is placed

String type, not empty

Zero or one (optional)

Any other element

Any (outside of the scope of OWS Context)

Zero or more (optional)

<xz>.features[i]. properties.*

a This specification assigns no significance to the order of appearance object elements. b The features array entries MUST contain one or more elements on the authors array, unless the parent GeoJSON object contains at least one element on its authors array. c A features array entry MUST NOT contain more than alternate element with the same combination of type and lang element values d Because it describes a resource potentially large in size and might require special handling the length and type attribute SHOULD be provided. e <xz> is the name of the geojson object that depends on the implementation

7.1.2.1 id Path: <xz>.features[i].id This element defines a mandatory reference to the identification of the Context resource. Its content SHALL be an IRI, as defined by RFC-3987. By defining it as an "IRI" the use of relative references is excluded and it SHALL NOT be assumed to convey dereferencable information. The content of this element SHALL be created in a way that assures uniqueness and follow the recommendations of RFC-4287 section 4.2.6. The id should be in canonical form and avoiding the use of URI like http://server.com/path and using http://server.com/path/ instead. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, ... }] }

7.1.2.2 title Path: <xz>.features[i].properties.title This element is mandatory and SHALL convey a human-readable title of the Context resource. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "properties" : { "title": " Base World Map”, ... }, ... }] }

7.1.2.3 abstract Path: <xz>.features[i].properties.abstract This element is optional and contains the description of the Context resource purpose or content. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#MERIS”, "properties" : { "abstract": "ENVISAT MERIS Level 1 Reduced Resolution”, ... }, ... }] }

7.1.2.4 updateDate Path: <xz>.features[i].properties.updated This element is optional and contains the date of a creation or update of the Context resource (ISO-8601 date). This value indicates the most recent instant in time when the Context resource was modified in a way the publisher considers significant and not necessarily covering all any minor modifications. The content of this element SHALL conform to the "date-time" production in RFC-3339. In addition, an uppercase "T" character SHALL be used to separate date and time, and an uppercase "Z" character SHALL be present in the absence of a numeric time zone offset. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "properties" : { "updated": "2012-05-10T14:35:00.400Z”, ... }, ... }] }

7.1.2.5 author Path: <xz>.features[i].properties.authors[j].name This element is optional and indicates the authors array of the Context resource. It MAY contain name (conveys a human-readable name for the person), email (email address for the person) and uri (home page for the person) elements. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "title": " Base World Map”, "properties" : { "authors" : [{

"name" : "Joe Doe”, "email" : "[email protected]", "uri" : "http://some.com/jdoe" }] ... }, ... }] }

7.1.2.6 publisher Path: <xz>.features[i].properties.publisher This element is optional and defines an entity responsible for making the Context resource available. Examples of a Publisher include a person, an organization, or a service. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "properties" : { "publisher": "ACME Project”, ... }, ... }] }

7.1.2.7 rights Path: <xz>.features[i].properties.rights This element is optional and contains information about rights held in and over the Context resource. Please note that this element SHALL NOT be used to convey machinereadable licensing information { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : {

... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "properties" : { "rights": "ACME Srl, licensed under a Creative Commons Attribution 3.0 License", ... }, ... }] }

7.1.2.8 geospatialExtent Path: <xz>.features[i].geometry This element is optional and expresses the geographic area of interest of the Context resource according to the GeoJSON geometry object. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "geometry": { "type" : "Polygon", "coordinates" : [[[-2,45],[8,45],[8,55],[-2,55],[-2,45]]] }, "properties" : { ... }, ... }] }

7.1.2.9 temporalExtent Path: <xz>.features[i].properties.date This element is optional and expresses a date or range of dates relevant to the Context document. It can contain the element start, stop and instant. The values of these elements SHALL conform to the "date-time" production of ISO-8601. An uppercase "T" character 28 Copyright © 2017 Open Geospatial Consortium

SHALL be used to separate date and time, and an uppercase "Z" character SHALL be present in the absence of a numeric time zone offset. To specify a range of dates the "/" character SHALL be used. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#world_countries”, "properties" : { "date": "2009-01-23T09:08:56.000Z/2009-01-23T09:14:08.000Z", ... }, ... }] }

7.1.2.10 preview The preview property of the Context resource is optional and can be expressed by using the following elements: Path: <xz>.features[i].properties.links.previews[j].href Reference to a quick-look or browse image representing the Context resource. The attributes length and type SHOULD be provided { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wmts/#algal20090123090856”, "properties" : { "links": { "previews" : [{ "href" : "http://www.acme.com/products/algal20090123090856.png", "type" : "image/png", "length" : "12321", "title" : " Quicklook for the entry 2009-01-23 09:08:56" }]

} ... }, ... }] }

7.1.2.11 contentDescription Path: <xz>.features[i].properties.links.alternates[j].href This element is optional and contains a reference to a description of the Context resource in alternative format. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "links": { "alternates" : [{ "href" : "http://www.acme.com/products/algal20090123090856.html", "type" : "text/html", "title" : "Information for the entry 2009-01-23 09:08:56" }] } ... }, ... }] }

7.1.2.12 contentByRef Path: xz.features[i]. properties.links.data[j].href This element is optional and contains a reference to the location of the data resource described in the Context resource. Because it describes a resource potentially large in size and might require special handling the length and type attributes SHOULD be provided. { "type": "FeatureCollection",

"id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "links": { "data" : [{ "href" : "http://www.acme.com/products/algal20090123090856.hdf", "type" : "application/x-hdf5", "length" : "453123432", "title" : "HDF file for the entry 2009-01-23 09:08:56" }] } ... }, ... }] }

7.1.2.13 offering Path: xz.features[i].properties.offerings[i] This element is optional and can contain a number of offerings defined by the class OWC:Offering (defined in section 7.1.3 below). This standard assigns no significance to the order of appearance on the offerings array. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", ... },{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", ... }] ...

}] }

7.1.2.14 active Path: <xz>.features[i].properties.active This element optional and is a Boolean value indicating to the client if the Context resource should be displayed by default. Example: { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "active": true, ... }, ... }] }

7.1.2.15 resourceMetadata Path: xz.features[i]. properties.links.via.href This element is optional and contains a reference to a resource from which the present resource is derived. Any alternative representation of the resource should use the alternative representation shown in 7.1.2.10. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”,

"properties" : { "links": { "via" : { "href" : "http://www.acme.com/products/algal20090123090856.xml", "type" : "application/xml", "length" : "435", "title" : "XML metadata file for the entry 2009-01-23 09:08:56" } } ... }, ... }] }

7.1.2.16 keyword Path: <xz>.features[i].properties.categories[j].term This array is optional and expresses a category related to the Context resource. Keyword MAY have a related code-list that is identified by the scheme attribute. Each item of the category array has one required element, term (identifies the category), and two optional elements, scheme (identifies the categorization scheme via a URI) and label (provides a human-readable label for displaying). This standard assigns no significance to the order of items in the array. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ ... "properties" : { "categories" : [{ "scheme" : "http://www.acme.com/category", "term" : "high_concentration", "label" : "High Concentration was detected on this entry" },{ "scheme" : "http://www.earthobservations.org/category", "term" : "GEOSSDataCore", "label" : "GEOSS Data Collection of Open Resources for Everyone" },{ ... }] ...

}] }

7.1.2.17 minScaleDenominator Path: <xz>.features[i].properties.minscaledenominator This element is optional and defines the minimum scale denominator for the display of the resource. The scale denominator is defined with respect to a “standardized rendering pixel size” of 0.28 mm × 0.28 mm (millimeters). The definition is the same used in WMS 1.3.0 [OGC 06-042] and in the OGC Symbology Encoding Implementation Specification 1.1.0 [05-077r4]. Frequently, the true pixel size is unknown and 0.28 mm is a common actual size for current displays. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "minscaledenonimator" : 100.0, ... }, ... }] }

7.1.2.18 maxScaleDenominator Path: <xz>.features[i].properties.maxscaledenominator This element is optional and defines the maximum scale denominator for the display of the resource. The scale denominator is defined with respect to a “standardized rendering pixel size” of 0.28 mm × 0.28 mm (millimeters). The definition is the same used in WMS 1.3.0 [OGC 06-042] and in the OGC Symbology Encoding Implementation Specification 1.1.0 [05-077r4]. Frequently, the true pixel size is unknown and 0.28 mm is a common actual size for current displays. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : {

... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "maxscaledenominator" : 1000000.0, ... }, ... }] }

7.1.2.19 folder Path: <xz>.features[i].properties.folder This element is optional and defines the folder name in a folder structure in which the resource is placed. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, "properties" : { "folder" : "/root/algal", ... }, ... }] }

7.1.2.20 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 2. 7.1.3 DataType OWC:Offering The mapping between the OWC:Offering Class and JSON is shown in the table below.

Table 3 - Definitions of owc:Offering elements Names: Conceptual JSON mapping a code <off>.code

operation <off>. operations[k]

content <off>. contents[k]

styleSet

Definition

Data type and values

Multiplicity and use

Code identifying the type of offering

One (mandatory)

Array of operations used to invoke the service

URI A requirement class identifier (URI) for the extension defining the operation. See sections 7.1.9.1 to 7.12 owc:OperationType, see Table 4

Array of contents (inline or byRef)

owc:ContentType, see Table 5

Zero or more (optional)

Array of style sets

owc:StyleSetType, see Table 6 Any (outside of the scope of OWS Context)

Zero or more (optional) Zero or more (optional)

<off>.styles[k]

extension

Any other element

<off>.* a

Zero or more (optional)

<off> is the name of the offering object in the offerings Array <xz>.features[i].properties. offerings[j]. <xz>.is the name of the geojson object.

7.1.3.1 code Path: <xz>.features[i].properties.offerings[j].code The offering code is defined as the requirement class identifier (URI) for the extension defining the operation. “code” can be an OWC extension or one defined in a profile. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", ... },{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", ... }]

... }] }

7.1.3.2 operation Path: <xz>.features[i].properties.offerings[j].operations[k] Defines an operation within an offering. Valid operations for an offering are defined in the relevant offering extension (Section 8.2.4 Class OWC:Operation). { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", "operations" : [{ "code" : "GetCapabilities", "href" : "http://www.someserver.com/wrs.cgi?REQUEST=GetCapabilities& amp;SERVICE=WMS&VERSION=1.1.1" }] ... },{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", ... }] ... }] }

7.1.3.3 content Path: <xz>.features[i].properties.offerings[j].contents[k] Defines a content within an offering of the class OWC:Content (see section 7.1.5)

7.1.3.4 styleSet Path: <xz>.features[i].properties.offerings[j].styles[k] Defines a style within an offering of the OWC:StyleSet (see section 7.1.6 class for further details). 7.1.3.5 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 3. 7.1.4 DataType OWC:Operation This class defines the operation either to get the information or to get the capabilities. Note that service specific extension requirements may mandate more than one operation. As such this element is an array of operations. Table 4 - Definitions of owc:Operation elements Names: Conceptual JSON mapping

Data type and values

Definition

Multiplicity and use

Code identifying the type of Operation

String type, not emptya

One (mandatory)

Code identifying the HTTP verb type of Operation.

String type, not empty. Example values are GET and POST. String type, not empty that contains a MIME media type. URL

One (mandatory)

Optional request body content

owc:ContentType, see Table 5

Zero or one (optional)

<op>.result

Optional Result Payload of the operationc

owc:ContentType, see Table 5

Zero or one (optional)

extension

Any other element

Any (outside of the scope of OWS Context)

Zero or more (optional)

code <op>.code

method <op>.method

<op>.type

MIME type of the expected results

requestURL

Service Request URL b

type

<op>.href

request <op>.request

result

<op>.*

Zero or one (optional) One (mandatory)

Names: Conceptual JSON mapping

Data type and values

Definition

Multiplicity and use

Typically the OGC Service request type, e.g. “GetCapabilities” or “GetMap”. Full request URL for an HTTP GET, and request URL for HTTP POST. c Not necessarily XML as the content is defined by MIME-type. If the content is text/xml or application/*+xml it SHALL be present as a XML fragment (without the <?xml... header) and the encoding SHALL be the same as the feed. e <op> is the name of the operation object in the operations Array <xz>.features[i].properties.offerings[j].operations[k]. <xz>.is the name of the geojson object. b

7.1.4.1 code Path: <xz>.features[i].properties.offerings[j].operations[k].code This identifies the type of operation. The valid operation types are defined within each specific extension within the OWS Context conceptual model [OGC 12-080]. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", "operations" : [{ "code" : "GetCapabilities", "href" : "http://www.someserver.com/wrs.cgi?REQUEST=GetCapabilities& amp;SERVICE=WMS&VERSION=1.1.1" }] ... },{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", ... }] ... }] }

This identifies the method (verb) of the operation. Default value is GET. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", "operations" : [{ "code" : "GetCapabilities", "method" : "GET", "href" : "http://www.someserver.com/wrs.cgi?REQUEST=GetCapabilities& amp;SERVICE=WMS&VERSION=1.1.1" }] ... },{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", ... }] ... }] }

7.1.4.3 type Path: <xz>.features[i].properties.offerings[j].operations[k].type “type” defines the MIME-type of the content class. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/csw/oceans”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/csw",

"operations" : [{ "code" : "GetRecords", "type" : "application/xml" "method" : "POST", "href" : "http://www.someserver.com/wrs.cgi?service=CSW&request= GetCapabilities&VERSION=2.0.2" }] }] ... }] }

7.1.4.4 requestURL Path: <xz>.features[i].properties.offerings[j].operations[k].href For HTTP GET the serviceURL item is used to capture the entire request. For POST (and SOAP) requests, the serviceURL is used to capture the address, and an additional request element (section 7.1.4.5) may be specified. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/wms/#algal20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/wms", "operations" : [{ "code" : "GetCapabilities", "method" : "GET", "href" : "http://www.someserver.com/wrs.cgi?REQUEST=GetCapabilities& amp;SERVICE=WMS&VERSION=1.1.1" }] }] ... }] }

7.1.4.5 request Path: <xz>.features[i].properties.offerings[j].operations[k].request.content request is an optional element of the type OWC:Content that captures the request of an operation as it was sent to the server. This can be defined inline or as a reference. For POST and SOAP Requests, an element request with the payload contents may be required. Note: not necessarily XML as the content is defined by MIME-type. If the content is text/xml or application/xml+* it SHALL be present as a XML fragment (without the <?xml... header) and the encoding SHALL be the same as the feed.

{ "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/csw/oceans/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/csw", "operations" : [{ "code" : "GetCapabilities", "method" : "GET", "href" : "http://www.someserver.com/wrs.cgi?service=CSW&request= GetCapabilities&VERSION=2.0.2" },{ "code" : "GetRecords", "type" : "application/xml", "method" : "POST", "href" : "http://www.someserver.com/wrs.cgi?service=CSW&request= GetCapabilities&VERSION=2.0.2", "request":{ "type" : "application/xml", "content" : "<csw:GetRecords maxRecords=\"10\" outputFormat=\"application/xml\" outputSchema=\"http://www.isotc211.org/2005/gmd\" resultType=\"results\" service=\"CSW\" startPosition=\"1\" version=\"2.0.2\" xmlns:ogc=\"http://www.opengis.net/ogc\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\"><csw:Query typeNames=\"csw:Record Service Association\" xmlns:ogc=\"http://www.opengis.net/ogc\"

xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\"><csw:ElementSetName typeNames=\"csw:Record\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\">full</csw:ElementSetName><cs w:Constraint version=\"1.1.0\" xmlns:ogc=\"http://www.opengis.net/ogc\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\"><ogc:Filter xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:PropertyIsEqualTo xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:PropertyName xmlns:ogc=\"http://www.opengis.net/ogc\">csw:Record/@id</ogc:PropertyName><ogc: Literal xmlns:ogc=\"http://www.opengis.net/ogc\">9496276a-4f6e-47c1-94bbf604245fac57</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter></csw:Constraint ></csw:Query></csw:GetRecords>" } }] }] ... }] }

7.1.4.6 result Path: <xz>.features[i].properties.offerings[j].operations[k].result.content Result is an optional element of the type OWC:Content that captures the result of an operation as it was returned from the server. This can be defined inline or as a reference. When the result content is inline XML it should be as a XML fragment (without the <?xml... header) and the encoding SHALL be the same as the GeoJSON file itself. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/csw/oceans/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/csw", "operations" : [{ "code" : "GetCapabilities", "method" : "GET", "href" : "http://www.someserver.com/wrs.cgi?service=CSW&request= GetCapabilities&VERSION=2.0.2" },{ "method" : "POST", "code" : "GetRecords",

"href" : "http://www.someserver.com/wrs.cgi?", "request":{ "type" : "application/xml", "content" : "<GetRecords service=\"CSW\" version=\"2.0.2\" maxRecords=\"5\" startPosition=\"1\" resultType=\"results\" outputFormat=\"application/xml\" outputSchema=\"http://www.opengis.net/cat/csw/2.0.2\" xsi:schemaLocation=\"http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\" xmlns=\"http://www.opengis.net/cat/csw/2.0.2\"><Query typeNames=\"csw:Record\" xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\" xmlns=\"http://www.opengis.net/cat/csw/2.0.2\"><ElementSetName typeNames=\"csw:Record\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\" xmlns=\"http://www.opengis.net/cat/csw/2.0.2\">full</ElementSetName><Constraint version=\"1.1.0\" xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\" xmlns=\"http://www.opengis.net/cat/csw/2.0.2\"><ogc:Filter xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:And xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:PropertyIsLike escapeChar=\"\\\" singleChar=\"?\" wildCard=\"*\" xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:PropertyName xmlns:ogc=\"http://www.opengis.net/ogc\">dc:title</ogc:PropertyName><ogc:Litera l xmlns:ogc=\"http://www.opengis.net/ogc\">*Elevation*</ogc:Literal></ogc:Propert yIsLike><ogc:Intersects xmlns:gml=\"http://www.opengis.net/gml\" xmlns:ogc=\"http://www.opengis.net/ogc\"><ogc:PropertyName xmlns:ogc=\"http://www.opengis.net/ogc\">ows:BoundingBox</ogc:PropertyName><gml :Envelope xmlns:gml=\"http://www.opengis.net/gml\"><gml:lowerCorner xmlns:gml=\"http://www.opengis.net/gml\">14.05 46.46</gml:lowerCorner><gml:upperCorner xmlns:gml=\"http://www.opengis.net/gml\">17.24 48.42</gml:upperCorner></gml:Envelope></ogc:Intersects></ogc:And></ogc:Filter>< /Constraint></Query></GetRecords>"}, "result":{ "type" : "application/xml", "content" : "<csw:Record xsi:schemaLocation=\"http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/record.xsd\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"

xmlns:ows=\"http://www.opengis.net/ows\" xmlns:dct=\"http://purl.org/dc/terms/\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\"><dc:creator xmlns:dc=\"http://purl.org/dc/elements/1.1/\">U.S. Geological Survey</dc:creator><dc:contributor xmlns:dc=\"http://purl.org/dc/elements/1.1/\">State of Texas</dc:contributor><dc:publisher xmlns:dc=\"http://purl.org/dc/elements/1.1/\">U.S. Geological Survey</dc:publisher><dc:subject xmlns:dc=\"http://purl.org/dc/elements/1.1/\">Elevation, Hypsography, and Contours</dc:subject><dc:subject xmlns:dc=\"http://purl.org/dc/elements/1.1/\">elevation</dc:subject><dct:abstra ct xmlns:dct=\"http://purl.org/dc/terms/\">Elevation data collected for the National Elevation Dataset (NED) based on 30m horizontal and 15m vertical accuracy.</dct:abstract><dc:identifier xmlns:dc=\"http://purl.org/dc/elements/1.1/\">ac522ef2-89a6-11db-91b17eea55d89593</dc:identifier><dc:relation xmlns:dc=\"http://purl.org/dc/elements/1.1/\">OfferedBy</dc:relation><dc:source xmlns:dc=\"http://purl.org/dc/elements/1.1/\">dd1b2ce7-0722-4642-8cd46f885f132777</dc:source><dc:rights xmlns:dc=\"http://purl.org/dc/elements/1.1/\">Copyright © 2004, State of Texas</dc:rights><dc:type xmlns:dc=\"http://purl.org/dc/elements/1.1/\">Service</dc:type><dc:title xmlns:dc=\"http://purl.org/dc/elements/1.1/\">National Elevation Mapping Service for Texas</dc:title><dct:modified xmlns:dct=\"http://purl.org/dc/terms/\">2004-03-01</dct:modified><dc:language xmlns:dc=\"http://purl.org/dc/elements/1.1/\">en</dc:language><ows:BoundingBox xmlns:ows=\"http://www.opengis.net/ows\"><ows:LowerCorner xmlns:ows=\"http://www.opengis.net/ows\">-108.44 28.229</ows:LowerCorner><ows:UpperCorner xmlns:ows=\"http://www.opengis.net/ows\">-96.223 34.353</ows:UpperCorner></ows:BoundingBox></csw:Record>"} }] }] ... }] }

7.1.4.7 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 4.

7.1.5 DataType OWC:Content This class defines a generic container for any content. It is the class defining the array elements of the objects offerings[i].contents[j], offerings[i].operations[j].request, offerings[i].operations[j].result and offerings[j].styles[k].content elements Table 5 - Definitions of owc:Content elements Names: Conceptual JSON mappinga type

Definition

Data type and values

Multiplicity and use

MIME type of the Content

String type, not empty that contains a MIME media type. URL

One (mandatory)

<cont>.type

URL

URL of the Content

<cont>.href

title

Title of the Content

<cont>.title <cont>.content

In-line content for the Content element

extension

Any other element

content

<cont>.*

String type, not empty String type, not empty that can contain any text encoded media type Any (outside of the scope of OWS Context)

Zero or one (optional) a Zero or one (optional) Zero or one (optional) a Zero or more (optional)

If the “href” attribute is present, the element content SHALL be empty. If “href” is not provided, content SHALL be provided. b <cont> is the name of the content that can be: <xz>.features[i].properties.offerings[i].contents[j], <xz>.features[i].properties.offerings[i].operations[j].request, <xz>.features[i].properties.offerings[i].operations[j].result and <xz>.features[i].properties.offerings[j].styles[k].content (<xz>.is the name of the geojson object)

7.1.5.1 type Path: <xz>.features[i].properties.offerings[j].operations[k].result.type Path: <xz>.features[i].properties.offerings[j].operations[k].request.type Path: <xz>.features[i].properties.offerings[j].contents[k].type Path: <xz>.features[i].properties.offerings[j].styles[k].content.type It defines the MIME-type of the content class.

7.1.5.2 URL Path: <xz>.features[i].properties.offerings[j].operations[k].result.href Path: <xz>.features[i].properties.offerings[j].operations[k].request.href Path: <xz>.features[i].properties.offerings[j].contents[k].href Path: <xz>.features[i].properties.offerings[j].styles[k].content.href7 “URL” provides the path to the content. This element can be a full URL or a relative reference. For example you can use an http:, ftp:, file: etc., or simply a file name if the OWS context document and the content share the same location. 7.1.5.3 content Path: <xz>.features[i].properties.offerings[j].operations[k].result.content Path: <xz>.features[i].properties.offerings[j].operations[k].request.content Path: <xz>.features[i].properties.offerings[j].contents[k].content Path: <xz>.features[i].properties.offerings[j].styles[k].content.content This element contains the inline content or a local file reference (encoded in any form in the document and definable via MIME Type). { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ "type" : "application/gml+xml", "content" : " <my_srf:RoadCollection gml:id=\"ID_ROADS1\" xsi:schemaLocation=\"http://www.opengis.net/gml/3.2 http://schemas.opengis.net/gml/3.2.1/gml.xsd http://www.opengis.net/owc/1.0/examples/gml/1 road.xsd\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:gml=\"http://www.opengis.net/gml/3.2\" xmlns:my_srf=\"http://www.opengis.net/owc/1.0/examples/example1\"><my_srf:road ><my_srf:Road gml:id=\"ID_ROAD1\"><my_srf:position><gml:LineString

gml:id=\"ID_LINEROAD1\">300 200</gml:pos><gml:pos>350 222</gml:pos></gml:LineString></my_srf:position><my_srf:width>4.1</my_srf:width ><my_srf:name>M30</my_srf:name></my_srf:Road></my_srf:road></my_srf:RoadCollect ion>" }] }] ... }] }

7.1.5.4 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 5. 7.1.6 DataType OWC:StyleSet This class defines a portrayal style for a resource inline or service derived content. It is specified at an offering level. Table 6 - Definitions of OWC:styleSet elements Names: Conceptual JSON mapping a name <style>.name

title <style>.title

abstract

Data type and values

Definition Unique name of the styleSet within a given offering Human Readable title of the styleSet within a given offering Description of the styleSet

<style>.abstract

default <style>.default

legendURL <style>.legendURL

content <style>.content

extension

Whether this styleSet is the one to be defined by default

URL of a legend image for the styleSet The inline or a external reference to the styleSet definition Any other element

<style>.* a

Multiplicity and use

String type, not empty String type, not empty

One (mandatory)

String type, not empty Boolean type. Possible values are 'true' or 'false'. Default value is ‘false’ URL

Zero or one (optional) Zero or one (optional)

owc:ContentType, see Table 5 Any (outside of the scope of OWS Context)

One (mandatory)

Zero or one (optional) Zero or one (optional) Zero or more (optional)

The intention of the StyleSet is that the client could visualize the resource using for example the WMS GetMap request (which would have defined styling) but could also offer the selection of alternative styles for the layer to the user. These would be derived from the style set offering. 7.1.6.1 name Path: <xz>.features[i].properties.offerings[j].styles[k].name The name of the style is used to present to the service in order to invoke a standard style. It is not required on referenced styles. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ ... }] "styles" : [{ "name": "Simple Line", ... }] ... }] }

7.1.6.2 title Path: <xz>.features[i].properties.offerings[j].styles[k].title This element is intended to provide a human readable name for an element (used in any label or legend for the style). { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... },

"features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ ... }] "styles" : [{ "title": "SLD Cook Book: Simple Line", ... }] ... }] }

7.1.6.3 abstract Path: <xz>.features[i].properties.offerings[j].styles[k].abstract The abstract provides a textual description of the style. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ ... }] "styles" : [{ "abstract": "SLD Cook Book: Simple Line extracted from http://docs.geoserver.org/latest/en/user/_downloads/line_simpleline.sld", ... }] ... }] }

7.1.6.4 default Path: <xz>.features[i].properties.offerings[j].styles[k].default Specifies the style to be applied when the service is invoked (other styles are there as alternatives). Note: The default does not need to be defined and is not required when a service request in an offering already has a way of specifying the default. For example, where a WMS request can include the style request, this element is not required. However, when specifying the style for a WFS or a GML File (where there is no place to specify styling) the default can be used.

7.1.6.5 legendURL Path: <xz>.features[i].properties.offerings[j].styles[k].legendURL The legend URL specifies a link to a legend image. Example: { "type": "FeatureCollection",

"id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ ... }] "styles" : [{ "legendURL": "http://docs.geoserver.org/latest/en/user/_images/line_simpleline1.png", ... }] ... }] }

7.1.6.6 Content Path: <xz>.features[i].properties.offerings[j].styles[k].content The content element allows an external or an inline style definition to be identified. It is a owc:Content class and as such if it has a value on the attribute href it SHALL NOT have inline content. This could potentially be an OGC Styled Layer Descriptor document but also potentially a Cascading Style Sheet. The valid types of document for a given service/inline content are specified in the relevant offering extension. { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ ... }] "styles" : [{

"name": "Simple Line Linked", "title": "SLD Cook Book: Simple Line Linked", "content": { "type": "application/vnd.ogc.sld+xml", "href": "http://docs.geoserver.org/latest/en/user/_downloads/line_simpleline.sld" } }] ... }] }

or an inline content as { "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ... }, "features": [{ "id": "http://www.acme.eu/geoserver/gml/draw20090123090856/”, ... "properties" : { "offerings" : [{ "code" : "http://www.opengis.net/spec/owc-geojson/1.0/req/gml", "contents" : [{ "type" : "application/gml+xml", "content" : " <my_srf:RoadCollection gml:id=\"ID_ROADS1\" xsi:schemaLocation=\"http://www.opengis.net/gml/3.2 http://schemas.opengis.net/gml/3.2.1/gml.xsd http://www.opengis.net/owc/1.0/examples/gml/1 road.xsd\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:gml=\"http://www.opengis.net/gml/3.2\" xmlns:my_srf=\"http://www.opengis.net/owc/1.0/examples/example1\"><my_srf:road ><my_srf:Road gml:id=\"ID_ROAD1\"><my_srf:position><gml:LineString gml:id=\"ID_LINEROAD1\">300 200</gml:pos><gml:pos>350 222</gml:pos></gml:LineString></my_srf:position><my_srf:width>4.1</my_srf:width ><my_srf:name>M30</my_srf:name></my_srf:Road></my_srf:road></my_srf:RoadCollect ion>" }] }] "styles" : [{ "name": "Simple Line</owc:name", "title": "SLD Cook Book: Simple Line", "content": { "type": "application/vnd.ogc.sld+xml", "content": "<StyledLayerDescriptor version=\"1.0.0\" xmlns=\"http://www.opengis.net/sld\" xmlns:ogc=\"http://www.opengis.net/ogc\"

xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.opengis.net/sld ../../../sld/1.1/StyledLayerDescriptor.xsd\"><NamedLayer><Name>Simple Line</Name><UserStyle><Title>SLD Cook Book: Simple Line</Title><FeatureTypeStyle><Rule><LineSymbolizer><Stroke><CssParameter name=\"stroke\">#000000</CssParameter><CssParameter name=\"strokewidth\">3</CssParameter></Stroke></LineSymbolizer></Rule></FeatureTypeStyle></U serStyle></NamedLayer></StyledLayerDescriptor>" } }] ... }] }

7.1.6.7 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 6. 7.1.7 DataType OWC:Creator This datatype class provides place to encode information related to the creator of the context document. It includes the creator application and any relevant properties or settings for the application. Table 7 - Definitions of owc:Creator elements Names: Conceptual JSON mapping

Definition

Data type and values

Multiplicity and use

creatorApplication

The name, reference and version of the creator application used to create the context document Properties of the display in use when the context document was created (for display based applications only). Any encoding should allow the user to extend the Creator information to include custom items

owc:CreatorApplication (as defined in Table 8)

Zero or one (optional)

owc:CreatorDisplay (as defined in Table 9)

Zero or one (optional)

n/a

Zero or more (optional)

<xz>.properties. generator

creatorDisplay <xz>.properties. display

Extension

7.1.7.1 creatorApplication The name, reference and version of the creator application used to create the context document. Complex type defined in Table 8.

7.1.7.2 creatorDisplay The properties of the creator display (Complex type as defined in Table 9). 7.1.7.3 extension Any other element can be added to the JSON object as long as they do not clash with the elements names defined within table 7.

7.1.8 DataType OWC:Creator/OWC:CreatorApplication This datatype class provides place to encode information related to the application responsible to the creation of the context document (not necessarily the content described). Table 8 - Definitions of owc:Creator/OWC:CreatorApplication elements Names: Conceptual JSON mapping Title

Data type and values

Definition Title or name of the application

String

Zero or one (optional)

URI describing the creator application

URI

Zero or one (optional)

Version of the creator application

String

Zero or one (optional)

<xz>.properties. generator.title

uri <xz>.properties. generator.uri

Version <xz>.properties. generator. version

Multiplicity and use

{ "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ..., "generator" : { "title": "Web Enterprise Suite", "uri": "http://www.somewebside.org/WebEnterpriseSuite" }, .... }, "features": [{ ... }] }

7.1.8.1 title Path: <xz>.properties.generator.title The content of this element SHALL be a human-readable text (character string). 7.1.8.2 uri Path: <xz>.properties.generator.uri The optional uri attribute is a URI that when dereferenced SHALL produce a representation that is relevant to the client (web address). 7.1.8.3 version Path: <xz>.properties.generator.version The optional version attribute is a character string that conveys the version of the generating application. 7.1.9 DataType OWC:Creator/OWC:CreatorDisplay The OWC:CreatorDisplay class provides place to encode information related to the display area used in the creator application when the OWS Context document was produced. This class is optional and intended for creator applications that use a graphical user interface with a geographical display within a fixed pixel size and not scalable to different computational devices. The set of properties of this class are only informative and creator applications should not expect clients to use them to reproduce the original graphical display. It is not intended that Client applications use the information in this class to define the size of their own graphical interface; the values present on this class are to be considered as creator application metadata. In addition, the presence of this class in a Context document should not be considered an indication of any type of limitation or constraint of the Context resources (features elements). The mapping between the OWC:CreatorDisplay Class and JSON encoding is shown in the table below. Table 9 - Definitions of owc:CreatorDisplay elements Names: Conceptual JSON mapping pixelWidth <xz>.properties. display.pixelWidth

pixelHeight <xz>.properties.disp lay.pixelHeight

Definition

Data type and values

Multiplicity and use

Width measured in pixels of the display showing the Area of Interest Width measured in pixels of the display showing by the Area of Interest

Positive Integer type

Zero or one (optional)

Positive Integer type

Zero or one (optional)

Names: Conceptual JSON mapping mmPerPixel <xz>.properties.disp lay.mmPerPixel

extension

Definition The size of a pixel of the display in milimeters (combined with the previous ones allows for the real display size to be calculated) Any other element

Data type and values Double type

Multiplicity and use Zero or one (optional)

Any

Zero or more (optional)

<xz>.properties.disp lay.*

{ "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/geojson/1/", "properties" : { ..., "display": [{ "pixelWidth": 600, "pixelHeight": 400, "mmPerPixel": 0.28 }], .... }, "features": [{ ... }] }

7.1.9.1 pixelWidth Path: <xz>.properties.display.pixelWidth The content of this element is an integer number representing the width of the display showing the Area of Interest. 7.1.9.2 pixelHeight Path: <xz>.properties.display.pixelHeight The content of this element is an integer number representing the height of the display showing the Area of Interest. 7.1.9.3 mmPerPixel Path: <xz>.properties.display.mmPerPixel

The content of this element is a floating point number representing the size of a pixel of the display in milimeters. 7.1.10 DataType links The links class provides place to encode link relations in a OWS Context document. This class is used in several places in the model and mimics the Atom link element and maps it into JSON. Table 10 - Definitions of links elements Data type and values

Multiplicity and use

URI describing the related URI resource Hint about the type of the String type, representation that is expected not empty to be returned when the value that contains of the href attribute is a media type. dereferenced Language of the resource String type, pointed to by the href attribute not empty with an RFC3066 code6 Human-readable information String type, about the link not empty Hint about the content length in Integer type, octets of the representation non-negative returned when the IRI in the href attribute is mapped to a URI and dereferenced. Any other element Any

One (mandatory)

JSON Name: <xz>.href <xz>.type

<xz>.lang

<xz>.title <xz>.length

extension

Definition

<xz>.*

Zero or one (optional)

Zero or one (optional) Zero or one (optional) Zero or one (optional)

Zero or more (optional)

{ ..., { "href" : "http://www.acme.com/collections/algal.xml", "type" : "application/xml", "title" : "Algal XML metadata", "lang" : "en" } ....

https://www.ietf.org/rfc/rfc3066.txt

7.1.10.1 href Path: <xz>.href Reference to a resource related to this one. 7.1.10.2 type Path: <xz>.type Expected MIME type of resource pointed by the href. 7.1.10.3 lang Path: <xz>.lang Expected language of resource pointed by the href. 7.1.10.4 title Path: <xz>.title This element contains the title of resource pointed by the href. This element conveys a human-readable title. 7.1.10.5 length Path: <xz>.length Expected length of resource pointed by the href. 7.2 GeoJSON WMS Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/wms Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/wms , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/wms/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced wms conformance class (see REF 1, OWS Context Conceptual Model)

7.3 GeoJSON WFS Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/wfs

Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/wms , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/wfs/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced wfs conformance class (see REF 1, OWS Context Conceptual Model)

7.4 GeoJSON WCS Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/wcs Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/wcs, http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/wcs/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced wcs conformance class (see REF 1, OWS Context Conceptual Model)

7.5 GeoJSON WPS Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/wps Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/wps , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/wps/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced wps conformance class (see REF 1, OWS Context Conceptual Model)

7.6 GeoJSON CSW Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/csw Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/csw , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced csw conformance class (see REF 1, OWS Context Conceptual Model)

7.7 GeoJSON WMTS Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/wmts Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/wmts , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-core/1.0/req/wmts/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced wmts conformance class (see REF 1, OWS Context Conceptual Model)

7.8 GeoJSON GML Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/gml Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/gml , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/gml/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced gml conformance class (see REF 1, OWS Context Conceptual Model)

Note it is also valid to specify a file or url reference to gml content. See the content class definition for details. 7.9 GeoJSON KML Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/kml Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/kml , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/kml/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced kml conformance class (see REF 1, OWS Context Conceptual Model) 61 Copyright © 2017 Open Geospatial Consortium

Note it is also valid to specify a file or url reference to gml content. See the content class definition for details. 7.10 GeoJSON GeoTIFF Offering Requirement Class:

http://www.opengis.net/spec/owc-geojson/1.0/req/geotiff

Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/geotiff , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/geotiff/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced geotiff conformance class (see REF 1, OWS Context Conceptual Model)

Note it is also valid to specify a file or url reference to GeoTIFF content. See the content class definition for details. 7.11 GeoJSON GMLJP2 Offering Requirement Class:

http://www.opengis.net/spec/owc-geojson/1.0/req/gmljp2

Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/gmljp2 , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/gmljp2/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced gmljp2 conformance class (see REF 1, OWS Context Conceptual Model)

7.12 GeoJSON GMLCOV Offering Requirement Class: http://www.opengis.net/spec/owc-geojson/1.0/req/gmlcov Scope:

All requirements in this subsection relate to the above requirement class)

Dependencies:

http://www.opengis.net/spec/owc/1.0/req/gmlcov , http://www.opengis.net/spec/owc-geojson/1.0/req/core

Requirement id:

http://www.opengis.net/spec/owc-geojson/1.0/req/gmlcov/content

Requirement tx:

Encodings of this offering shall be populated in accordance with the requirements of the referenced gmlcov conformance class (see REF 1, OWS Context Conceptual Model) 62 Copyright © 2017 Open Geospatial Consortium

8. Media Types for any data encoding(s) N/A

Annex A: Conformance Class Abstract Test Suite (Normative) This conformance test is targeted at the GeoJSON encoding of an OWS Context document and validates the encoding of an OWS Context Document is correct. A.1

Conformance Test Class: core

The OGC URI identifier of this conformance class is: http://www.opengis.net/spec/owcgeojson/1.0/conf/core. Tests identifiers below are shown in full but all relate to http://www.opengis.net/spec/owc-geojson/1.0/core. Fully Implements the Rules of GeoJSON URI: http://www.opengis.net/spec/owc-geojson/1.0/req/geojsonRules Test Purpose: To test requirement http://www.opengis.net/spec/owcgeojson/1.0/conf/geojsonRules Test Method: Validate the JSON encoded owc:context document is compliant with the GeoJSON specification by using a GeoJSON validator. Uses the specified MimeType URI: http://www.opengis.net/spec/owc-geojson/1.0/req/mimeType Test Purpose: To test requirement http://www.opengis.net/spec/owcgeojson/1.0/conf/mimeType Test Method: Validate that any reference to an OWS Context document uses the mimetype specified in the requirement. In terms of validation, this requirement may only be validated in terms of a reference from one OWS context document to another as it is a requirement on users of context documents. Uses the specified File Extension URI: http://www.opengis.net/spec/owc-geojson/1.0/req/fileExtension Test Purpose:

To test requirement http://www.opengis.net/spec/owcgeojson/1.0/conf/fileExtension Test Method: Validate that the OWS Context document uses the file extension specified in the requirement. Encoding of Content is compliant with OWS Context Content URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/owcencoding Test Purpose: To test requirement http://www.opengis.net/spec/owcgeojson/1.0/req/owcencoding Test Method Verify that the encoding of each of the owc:context classes correctly populates the properties including populating all mandatory properties in compliance with the specification using automated validation. A.2

Conformance Test Class: wms

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/wms Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/wms Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.3

Conformance Test Class: wfs

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/wfs Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/wfs Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation.

A.4

Conformance Test Class: wcs

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/wcs Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/wcs Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.5

Conformance Test Class: wps

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/wps Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/wps Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.6

Conformance Test Class: csw

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/csw Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/csw Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.7

Conformance Test Class: wmts

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/wmts Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/wmts Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation.

A.8

Conformance Test Class: gml

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/gml Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/gml Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.9

Conformance Test Class: kml

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/kml Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/kml Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.10 Conformance Test Class: geotiff

URI: http://www.opengis.net/spec/owc-geojson/1.0/cof /geotiff Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/geotiff Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation. A.11 Conformance Test Class: gmljp2

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/gmljp2 Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/gmljp2 Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation.

A.12 Conformance Test Class: gmlcov

URI: http://www.opengis.net/spec/owc-geojson/1.0/conf/gmlcov Test Purpose: To test requirement http://www.opengis.net/spec/owc-geojson/1.0/req/gmlcov Test Method: Verify that the encoding of offering using the above extension correctly populates the properties of the offering class using automated validation.

Annex B: Examples A.1

wmts.json

{ "type": "FeatureCollection", "id": "http://www.opengis.net/owc/1.0/examples/wmts/", "properties": { "lang": "en", "title": "WMTS Example", "subtitle": "WMTS Example", "updated": "2012-11-04T17:26:23Z", "authors": [{ "name": "Joan Masó" }], "links": { "profiles": [{ "href": "http://www.opengis.net/spec/owc-geojson/1.0/req/core", "title": "This file is compliant with version 1.0 of OGC Context" }] } }, "features": [ { "type": "Feature", "id": "http://www.opengis.net/spec/owc-geojson/1.0/req/wmts/1/", "geometry": { "type": "Polygon", "coordinates": [[[0.077448,41.03779],[0.077448,42.04698],[1.640905,42.04698], [1.640905,41.03779],[0.077448,41.03779]]] }, "properties": { "title": "WMTS Example", "abstract": "WMTS Example in KVP and REST", "updated": "2011-11-01T00:00:00Z", "content": "WMTS example", "offerings": [ { "code": "http://www.opengis.net/spec/owc-geojson/1.0/req/wmts", "operations": [ { "code": "GetCapabilities", "method": "GET", "type": "application/xml", "href":

"http://www.opengis.uab.es/cgibin/ICCTiled/MiraMon.cgi?REQUEST=GetCapabilities&SERVICE=WMTS" }, { "code": "ServiceMetadata", "method": "GET", "type": "application/xml", "href": "http://www.opengis.uab.es/SITiled/ICC/1.0.0/WMTSCapabilities.xml" }, { "code": "GetTile", "method": "GET", "type": "image/jpeg", "href": "http://www.opengis.uab.es/cgibin/ICCTiled/MiraMon.cgi?REQUEST=GetTile&SERVICE=WMTS&version=1.0.0&for mat=image/jpeg&layer=Topo250k_Vers5_ICC&TileMatrixSet=Cat_topo250k_v5_E PSG23031&TileMatrix=200m&TileRow=1&TileCol=0" }, { "code": "Tile", "method": "GET", "type": "image/jpeg", "href": "http://www.opengis.uab.es/SITiled/ICC/Topo250k_Vers5_ICC/default/Cat_t opo250k_v5_EPSG23031/200m/1/0.jpg" } ] } ] } } ]

}

Annex C: Schemas and Examples

The schemas and examples are provided in the OGC schema repository: http://schemas.opengis.net/owc/1.0

Annex D: Revision history

Date

Release

Author

Paragraph modified Description

OGC OWS Context GeoJSON Encoding Standard (version 1.0) — OGC 14-055r2

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