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title	DCAT

Following analysis and discussion in the W3C Dataset Exchange Working Group (DXWG), a proposed solution for cataloguing services in the context of a DCAT catalog has been developed – see the DCAT-2 Working Draft and Editors Draft. Classes for DataService and DataDistributionService have been added to the DCAT vocabulary. Examples of their use are shown here and here. Note that the second example is modelled on an instance from Research Data Australia. A summary of the solution is below:

DCAT	Concepts, for data-services and related data	Comment
dct:title	service title
dct:description	service description/ abstract
dcat:endpointDescription	service description/ abstract	Link to machine-readable endpointDescription, such as a Swagger or GetCapabilities document
rdf:type	service type: resource type
dct:conformsTo	service type: protocol and version	In DCAT a single service might support multiple interfaces or protocols, so this property may be repeated
dct:type	service type: function	In DCAT a service might have multiple classifiers, either at different levels of refinement or with values taken from different controlled vocabularies, so this property may be repeated
dcat:endpointURL	service URL	service API
dcat:landingPage	service URL	Human useable landing-page for the service (which might be provided at a different URL to the service API)
dcat:servesDataset	data subject, data spatial coverage, data geographic/projected CRS, data temporal coverage, data format, data rights, data contributor/owner/publisher, data language, data identifying information	In DCAT this is a link to a description of the dataset(s) served, which is packaged as a separate record. All of the dataset descriptors are provided as properties of that resource, and not as properties of the service itself.
dct:language	service language
dct:accessRights	service rights
dct:modified	service date (modified)
dct:creator\|publisher\|contributor prov:wasAttributedTo	service contributor/owner/publisher

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title	Example 1 - Service metadata provided in a dedicated service record (Geoscience Australia)

Service record from the GA metadata catalogue:

Service metadata extracted from the above and mapped to the core service concepts:

Service concept	Value
service URL	http://services.ga.gov.au/gis/services/DEM_SRTM_1Second_Slope/MapServer/WMSServer
service type: protocol and version	Protocol: WMS 1.3.0, 1.1.1
service type: resource type	service
data subject	Land topography models, Ecology landscape, elevation, slope
service title	Digital Elevation Model (DEM) of Australia derived from SRTM with 1 Second Grid - Smoothed Percentage Slope WMS
data spatial coverage	["112.000000 -44.000000,154.000000 -44.000000,154.000000 -9.000000,112.000000 -9.000000,112.000000 -44.000000"]
data geographic/projected CRS
data temporal coverage
service description/ abstract	Digital Elevation Model (DEM) of Australia derived from SRTM with 1 Second Grid - Smoothed Percentage Slope WMS
data format
service date (modified)	2018-06-18
service rights
data rights
data contributor/owner/publisher	Geoscience Australia
data language
service language
data identifying information	UUID: aac46307-fce8-449d-e044-00144fdd4fa6
service contributor/owner/publisher	Geoscience Australia

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title	Example 2 - Service metadata from within a dataset record combined with the response from a self-describing service (AODN)

IMAS UTAS dataset record in the AODN portal:

Hyperlink to Service URL within dataset record:

Service description at Service URL (OGC WFS) extracted from dataset metadata XML:

Summation of service metadata extracted from the above and mapped to the core service concepts:

Service concept	Value
service URL	http://geoserver.imas.utas.edu.au/geoserver/seamap/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=seamap:SeamapAus_NSW_marine_habitats_2002&outputFormat=SHAPE-ZIP
service type: protocol and version service type: function	Protocol: WFSFunction: Access
service type: resource type	service
data subject	bathymetry/seafloor topography...
service title	seamap
data spatial coverage	-27.64400, 149.28540, 154.29516, -37.60255
data geographic/projected CRS
data temporal coverage	2002-05-30
service description/ abstract
data format	SHAPE-ZIP
service date (modified)
service rights
data rights	CC-BY 4.0
data contributor/owner/publisher	IMAS UTAS
data language	English
service language	English
data identifying information	ID: 9a94d1ba-8509-4d78-8b55-d25fd222cdffName: MAP - NSW marine habitats
service contributor/owner/publisher	IMAS UTAS

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title	Example 3 - Service metadata from self-describing service OpenAPI (Atlas of Living Australia)

Service OpenAPI URL - description for multiple service endpoints provided in json:

Summation of service metadata extracted from the above and mapped to the core service concepts:

Service concept	Value
service URL	http://biocache-ws.ala.org.au/ws/occurrences/search*
service type: protocol and version	webservice search Parameters: fq - array(False) formattedFq - array(False) facets - array(False) formattedQuery - string(False) q - string(False) ...
service type: resource type	service
data subject	occurrence
service title	occurrenceSearchUsingGET
data spatial coverage
data geographic/projected CRS
data temporal coverage
service description/ abstract	occurrenceSearchUsingGET operation available at biocache-service API
data format	json
service date (modified)
service rights
data rights
data contributor/owner/publisher
data language
service language
data identifying information
service contributor/owner/publisher	Atlas of Living Australia

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