better intro to mapping

dcat/index.html

@@ -2291,13 +2291,15 @@ <h2>Alignment with other metadata vocabularies</h2>
 <section id="dcat-sdo" class="informative">
 	<h3>Schema.org</h3>
 	<p>
-		<a href="https://schema.org/">Schema.org</a> includes a number of types and properties taken from, or at least inspired by, the original DCAT work.
-		With the appearance of Google's <a href="https://g.co/datasetsearch">Dataset Search service</a> the relationship of DCAT with schema.org is of interest.
-		A mapping between DCAT and schema.org can be inferred from inspection of the examples in <a href="https://developers.google.com/search/docs/data-types/dataset">Google's documentation of dataset metadata</a>, but a systematic mapping is not available.
-		Partial mappings between DCAT 2014 [[VOCAB-DCAT-20140116]] and schema.org have been provided 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> and by the <a href="https://ec-jrc.github.io/dcat-ap-to-schema-org/">European Commission</a>.
+		<a href="https://schema.org/">Schema.org</a> includes a number of types and properties taken from (or at least inspired by) the original DCAT work, and the index for Google's <a href="https://g.co/datasetsearch">Dataset Search service</a> utilises both schema.org and DCAT.
+		However, most general purpose indexes that pay attention to metadata at all rely primarily on schema.org, so the detailed relationship of DCAT to schema.org is of interest for data providers who wish their datasets and services to be exposed through those.
 	</p>
 	<p>
-		A mapping from the revised DCAT (this document) to schema.org is <a href="https://github.com/w3c/dxwg/blob/gh-pages/dcat/rdf/dcat-schema.ttl">provided in an RDF file</a>.
+		A mapping between DCAT and schema.org can be inferred by comparing the examples in <a href="https://developers.google.com/search/docs/data-types/dataset">Google's documentation of dataset metadata</a>, but a systematic mapping is not available.
+		Partial mappings between DCAT 2014 [[VOCAB-DCAT-20140116]] and schema.org have earlier been provided 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> and by the <a href="https://ec-jrc.github.io/dcat-ap-to-schema-org/">European Commission</a>.
+	</p>
+	<p>
+		A recommended mapping from the revised DCAT (this document) to schema.org is <a href="https://github.com/w3c/dxwg/blob/gh-pages/dcat/rdf/dcat-schema.ttl">available in an RDF file</a>.
 		This mapping is axiomatized using the standard predicates <code>rdfs:subClassOf</code>, <code>rdfs:subPropertyOf</code>, <code>owl:equivalentClass</code>, <code>owl:equivalentProperty</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.
 	</p>