Support non-URIs in DiSCO creator field

[karenhanson]

Tim has generated fields like this, where the object of the creator is a blank node. The system currently complains that creator is not a URI and falls over.

#!xml

<rmap:DiSCO>
        <rdf:type rdf:resource="http://rmap-project.org/rmap/terms/DiSCO"/>
        <dcterms:creator rdf:nodeID="d0e1"/>
        <rmap:aggregates ...

...

<rdf:Description rdf:nodeID="d0e1">
    <dc:creator>RMap-Datacite-Harvester 0.9</dc:creator>
</rdf:Description>

Should we support blank nodes for DiSCO creator - probably makes sense since people may use this to put in a foaf:name or something.

Sheila's comment: After some discussion 3 things allowed dc:creatorsome string heredc:creator <dcterms:creator rdf:resource=""/> and then bnode as above (But seriously - not dc:creator -- try foaf or something)