docs/schema_org_rdfa.html has href="dc:Event" instead of @resource

[danbri]

This issue is a duplicate of #70

1. the RDFa syntax is wrong - href doesn't expect qualified names
2. the namespace is wrong; Event is is dc's type namespace.

http://dublincore.org/documents/2012/06/14/dcmi-terms/?v=terms#dcmitype-Event

The RDFa initial context file doesn't define a prefix for dcmi-type, http://www.w3.org/2011/rdfa-context/rdfa-1.1

The correct uri would be http://purl.org/dc/dcmitype/Event

[danbri]

Reported http://lists.w3.org/Archives/Public/public-vocabs/2014Aug/0149.html by Peter Patel-Schneider.

Ivan / W3C's RDFa 1.1 parser reports "[In element 'link'] Unusual URI scheme used in
dc:Event; may that be a mistake, e.g., resulting from using an undefined
CURIE prefix or an incorrect CURIE?" (http://www.w3.org/2012/pyRdfa/)

Addressing this should also address the issue for other types, "Unusual URI scheme used in
dcat:DataCatalog; may that be a mistake, e.g., resulting from using an
undefined CURIE prefix or an incorrect CURIE?"". Easier for those as they are in a namespace that's in the RDFa Initial Context, and so can be passed through without namespace processing being added.

Suggested actions:

1. remove dc:Event for now
2. move other mappings into @resource instead of @href.

[danbri]

We already have an issue tracking this from gregg, closing as duplicate.

#70