W3C home > Mailing lists > Public > public-rdf-wg@w3.org > May 2012

Why empty named graphs make sense

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Wed, 16 May 2012 17:33:12 +0100
Message-ID: <4FB3D6C8.3020801@epimorphics.com>
To: RDF-WG <public-rdf-wg@w3.org>
1/ Scenario:

A site publishes a page, in RDFa, with triples in it.

The site replaces that page, with one saying, "changes in progress, 
please come back later" with no triples.

Recording this seems like a reason to have empty named graphs.

2/ The default graph can be empty.

3/ A point made has been that N-quads can't represent an empty named graph.

A syntax fix could be:

_ <http://space> .

or other style indicate a space name.

To my reading, the spaces document works if "quads" are removed, not 
that I'm suggesting that.

How about defining as a convenience of useful vocabulary rather than 
core definition?

Received on Wednesday, 16 May 2012 16:33:38 UTC

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