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Merge pull request #623 from w3c/andrea-perego-dcat-schema-org
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Editorial revision to Section 12.1 - Schema.org
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Simon Cox committed Dec 14, 2018
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Expand Up @@ -2544,26 +2544,26 @@ <h3>Schema.org</h3>
Schema.org [[SCHEMA-ORG]] includes a number of types and properties based on the original DCAT work (see <a href="https://schema.org/Dataset">schema:Dataset</a> as a starting point),
and the index for Google's <a href="https://g.co/datasetsearch">Dataset Search service</a> relies on structured description in web pages about datasets based on both
<a href="https://developers.google.com/search/docs/data-types/dataset">schema.org and DCAT</a>.
A comparison of the DCAT backbone, showed in <a href="#vocabulary-overview">Figure 1. above</a> with related classes from schema.org shows the similarity:
A comparison of the DCAT backbone, showed in <a href="#vocabulary-overview">Figure 1. above</a> with related classes from [[SCHEMA-ORG]] shows the similarity:
</p>
<figure id="fig2"><img alt="UML model of schema.org classes and properties related to dataset catalogs" src="UML/schema.org-dataset.png">
<figcaption>
schema.org support for dataset catalogs, showing a selection of schema.org properties that have the classes shown within their domain and range
</figcaption>
</figure>
<p>
General purpose web search services that use metadata at all rely primarily on schema.org, so the relationship of DCAT to schema.org is of interest for data providers
General purpose web search services that use metadata at all rely primarily on [[SCHEMA-ORG]], so the relationship of DCAT to [[SCHEMA-ORG]] is of interest for data providers
who wish their datasets and services to be exposed through those indexes.
</p>
<p>
A <a href="https://www.w3.org/wiki/WebSchemas/Datasets">mapping between DCAT 2014 and schema.org</a> was discussed on the original proposal to extend schema.org for describing datasets and data catalogs.
Partial mappings between DCAT 2014 [[VOCAB-DCAT-20140116]] and schema.org were provided earlier by the
<a href="https://ec-jrc.github.io/dcat-ap-to-schema-org/">European Commission</a> and the <a href="https://www.w3.org/2015/spatial/wiki/ISO_19115_-_DCAT_-_Schema.org_mapping">Spatial Data on the Web Working Group</a>.
A <a href="https://www.w3.org/wiki/WebSchemas/Datasets">mapping between DCAT 2014 and schema.org</a> was discussed on the original proposal to extend [[SCHEMA-ORG]] for describing datasets and data catalogs.
Partial mappings between DCAT 2014 [[VOCAB-DCAT-20140116]] and [[SCHEMA-ORG]] were provided earlier by the
<a href="https://www.w3.org/2015/spatial/wiki/ISO_19115_-_DCAT_-_Schema.org_mapping">Spatial Data on the Web Working Group</a>, building upon previous work.
</p>
<p>
A recommended mapping from the revised DCAT (this document) to schema.org is <a href="https://raw.githubusercontent.com/w3c/dxwg/gh-pages/dcat/rdf/dcat-schema.ttl">available in an RDF file</a>.
A recommended mapping from the revised DCAT (this document) to [[SCHEMA-ORG]] is <a href="https://raw.githubusercontent.com/w3c/dxwg/gh-pages/dcat/rdf/dcat-schema.ttl">available in an RDF file</a>.
This mapping is axiomatized using the predicates <code>rdfs:subClassOf</code>, <code>rdfs:subPropertyOf</code>, <code>owl:equivalentClass</code>, <code>owl:equivalentProperty</code>, <code>skos:closeMatch</code>,
and also using the annotation properties <code>schema:domainIncludes</code> and <code>schema:rangeIncludes</code> to match schema.org semantics. The mapping is summarized in the table below, considering the prefix <code>schema</code> as <code>http://schema.org/</code>.
and also using the annotation properties <code>schema:domainIncludes</code> and <code>schema:rangeIncludes</code> to match [[SCHEMA-ORG]] semantics. The mapping is summarized in the table below, considering the prefix <code>schema</code> as <code>http://schema.org/</code>.
</p>
<p class="issue" data-number="251">
This alignment of DCAT with schema.org is provisional and non-normative. Feedback is invited in the <a href="https://github.com/w3c/dxwg/issues/251">issue tracker</a>.
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