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"the graphs referred to in the FROM clauses" [comment: major technical: underspecified errors]

From: Dan Connolly <connolly@w3.org>
Date: Thu, 12 Jan 2006 17:09:42 -0600
To: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Message-Id: <1137107382.19546.427.camel@dirk.w3.org>

In "major technical: underspecified errors"

we find...

> Also in this section,
> there is no mention of any syntax or runtime checks that an IRI
> actually identifies a graph.  Possibly the interpretation of an IRI that
> does not identify a graph is that the graph is empty.  However, this would
> be a disservice to the user since it would not alert the user to
> a typo in spelling a graph IRI.  It would be better to specify an error.
> Presumably the list of acceptable IRIs would be implementation-defined.

I was going to say that this is covered by this text:

The FROM NAMED syntax suggests that the IRI identifies the corresponding graph,
but actually the relationship between a URI and a graph in an RDF dataset is indirect.
the IRI identifies a resource, and the resource is represented by a graph
(or, more precisely: by a document that serializes a graph).
For further details see [WEBARCH].

but now I'm not so sure.

In 9 Specifying RDF Datasets...

The dataset resulting from a number of FROM and FROM NAMED clauses is:

      * a default graph consisting of the merge of the graphs referred
        to in the FROM clauses 
      * a set of (IRI, graph) pairs, one from each FROM NAMED clause.

we refer to "the graphs referred to in the FROM clauses". I wonder
if that's coherent... hmm...

Dan Connolly, W3C http://www.w3.org/People/Connolly/
D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E
Received on Thursday, 12 January 2006 23:09:48 UTC

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