ISSUE-82: How should repeated graph iri labels be handled in TriG

TriG repeated graph iris

How should repeated graph iri labels be handled in TriG

State:

CLOSED

Product:

RDF Turtle

Raised by:

Gavin Carothers

Opened on:

2011-12-21

Description:

There are a number of ways of handling the case of multiple instances of a graph iri labelling a number graph statements.

Sample TriG Document:

@base <http://example.com/>
<graph> { <s> <p> <o> . }
<graph> { <s2> <p> <o2> . }

1) Disallowed (TriG input document behaviour)

"In a TriG document a graph IRI must not be used to label more then one graph."

Result: Parse Error

2) Merge

"In a TriG document graph statements with the same graph IRI should be merged to form a single RDF Graph."

Result:
@base <http://example.com/>
<graph> { <s> <p> <o> .
<s2> <p> <o2> . }

Note: BlankNode labels in each graph statement would either result in shared blank nodes or independent blank nodes (??)

3) Replace

"Upon encountering a graph statement with the same graph IRI of another graph statement, the most recently parsed RDF Graph should replace the earlier one in the RDF Dataset."

Result:
@base <http://example.com/>
<graph> { <s2> <p> <o2> . }

4) Ignore

"Graph statements with a repeated graph IRI are ignored. Only the first graph statement is added to the RDF Dataset."

Result:
@base <http://example.com/>
<graph> { <s> <p> <o> . }

5) Document Decides

Apply one of 1-4 on the basis of a directive "@policy". Default to Disallowed.

Related Actions Items:

No related actions

Related emails:

1. TriG statement to resolve ISSUE-82 (from gavin@carothers.name on 2012-01-25)
2. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from phayes@ihmc.us on 2012-01-04)
3. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from sandro@w3.org on 2012-01-03)
4. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from steve.harris@garlik.com on 2011-12-21)
5. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from lee@thefigtrees.net on 2011-12-21)
6. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from andy.seaborne@epimorphics.com on 2011-12-21)
7. Re: RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from gavin@carothers.name on 2011-12-21)
8. RDF-ISSUE-82 (TriG repeated graph iris): How should repeated graph iri labels be handled in TriG [RDF Turtle] (from sysbot+tracker@w3.org on 2011-12-21)

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