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BIBFRAME  August 2014

BIBFRAME August 2014

Subject:

Re: Blank nodes, xml, ttl was: [BIBFRAME] Proposal to handle "Providers" differently

From:

Thomas Berger <[log in to unmask]>

Reply-To:

[log in to unmask]

Date:

Fri, 1 Aug 2014 20:59:39 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (57 lines)

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Karen,

> Thomas, could you indicate which SPARQL 1.1 spec you are referencing, and the
> section? Thanks. It looks like predicate paths in 1.1 may resolve this. The main
> thing is to try some actual queries against actual data. I will do that later
> today. I will try the search using triples to avoid the issue of skolemizing
> behind the scenes, and against more than one software package. (Soroka, could
> you try the triples I provided using Jena? Thanks.)

http://www.w3.org/TR/sparql11-query/

especially:

4.1.4 Syntax for Blank Nodes

"Blank nodes in graph patterns act as variables, not as references to specific
blank nodes in the data being queried."

(followed by examples for queries)


I do not see any difference to the same section in the SPARQL 1.0 specification
http://www.w3.org/TR/rdf-sparql-query/


and

18.4 Property Path patterns

After the box "Definition: Evaluation of Sequence Property Path" it tells:

"Informally, this is the same as:

SELECT * { X P _:a . _:a Q Y }

using the fact that a blank node _:a acts like a variable (under simple
entailment) except it does not appear in the results from SELECT *."




viele Gruesse
Thomas Berger
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