Fixes typo for rdfs:label URI in schema.rdfa (#2312)
Fixes typo for rdfs:label URI in schema.rdfa (#2312)

"rdfs:label" was used as value for the href attribute.
It was leading to the generation of the triple "schema:name rdfs:subPropertyOf <rdfs:label>"
instead of "schema:name rdfs:subPropertyOf rdfs:label"
(the rdfa parsers do not resolve namespace prefixes in the "href" attribute value).
schemaorg/schemaorg,vholland/schemaorg,vholland/schemaorg,vholland/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,vholland/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg