Am 18.03.2017 um 19:03 schrieb Bob DuCharme:
> What makes a predicate a direct claim predicate?
It's a predicate (that's what RDF calls all relationships) that expresses a
direct claim (as opposed to a full statement).
Direct claims are one of two ways Wikidata Statements are mapped to RDF. In the
wikidata query service, each statement is represented twice - once as a full
statement, and once as a direct claim.
Direct claims represent a "naive projection" of wikidata to RDF: everything that
is claimed (by anyone) to be true (under any circumstances) is assumed to be
true. So you get triples like <wd:Q64> <wdt:P1376> <wd:Q183> meaning "Berlin -
capital-of - Germany".
Simple to work with, but incomplete: you also get <wd:Q64> <wdt:P1376>
<wd:Q27306> ("Berlin - capital-of - Kingdom of Prussia"), without an easy way
to see that one is current and the other is not.
To get all the additional context information, you need to look at the full
statement representation, which provides a complex structure of value,
qualifiers, and source references. The full mapping will use predicates with the
"wds" prefix to connect the item (subject) to the structure representing the
statement with all its parts.
--
Daniel Kinzler
Senior Software Developer
Wikimedia Deutschland
Gesellschaft zur Förderung Freien Wissens e.V.
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