[Wikidata] wikibase:directClaim predicate?

[Bob DuCharme]

Could someone tell me what this means? 
http://wikiba.se/ontology-1.0.owl#directClaim describes it as a "Link 
between Wikibase Property and direct claim predicate" and the definition 
in https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format is 
similar.

What makes a predicate a direct claim predicate?
Thanks,

Bob


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