Change equvalentClass for DataCatalog to dcat:Catalog, as dcat:DataCatalog does not exist.

Author: gkellogg

data/schema.rdfa

@@ -3539,7 +3539,7 @@
       <span property="rdfs:comment">A collection of datasets.</span>
        <span>Subclass of: <a property="rdfs:subClassOf" href="http://schema.org/CreativeWork">CreativeWork</a></span>
        <span>Source:  <a property="dc:source" href="http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_DatasetClass">DatasetClass</a></span>
-       <link property="owl:equivalentClass" href="http://www.w3.org/ns/dcat#DataCatalog"/>
+       <link property="owl:equivalentClass" href="http://www.w3.org/ns/dcat#Catalog"/>
     </div>
 
     <div typeof="rdfs:Class" resource="http://schema.org/DataDownload">