[namedgraphs] Default / unlabelled graphs in TriG

[Olaf H. <ha...@in...>]

Hey Chris and Richard,

(CCing to the NG4J list)

According to  the TriG spec. at

 http://www4.wiwiss.fu-berlin.de/bizer/TriG/

TriG allows default graphs which are unlabelled - see example 3 as well as 
the 'graph' rule in the EBNF grammar. Is this correct?

In the JUnit tests for the TriG parser in NG4J we have a test 
case 'testUnlabelledGraph' (line 54 in file 
tests/de/fuberlin/wiwiss/ng4j/trig/TriGParserTest.java) that explicitly 
rejects unlabelled graphs.

I'm puzzled. Are unlabelled default graphs allowed or disallowed in TriG?

Greetings,
Olaf