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Re: Graph-State Resources (was Re: graphs and documents Re: [ALL] agenda telecon 14 Dec)

From: Dan Brickley <danbri@danbri.org>
Date: Thu, 15 Dec 2011 19:35:14 +0100
Message-ID: <CAFNgM+ZOq_jGQ_Srs22kzdD2QnKCNSKOV8efmfdNWmt5-aeU5g@mail.gmail.com>
To: Andy Seaborne <andy.seaborne@epimorphics.com>
Cc: public-rdf-wg@w3.org
On 15 December 2011 14:08, Andy Seaborne <andy.seaborne@epimorphics.com> wrote:
> On 14/12/11 23:03, Sandro Hawke wrote:
>>
>> But I've given up on that resistance, and am
>> finding the idea of
>>
>> something-with-an-RDF-Graph-as-its-State-as-far-as-Web-Clients-are-concerned
>> is pretty simple, too.
>
>
> and FROM NAMED uses that as the label.
>
> PREFIX log:     <http://www.w3.org/2000/10/swap/log#>
> PREFIX rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX rdfs:    <http://www.w3.org/2000/01/rdf-schema#>
>
> SELECT *
> FROM NAMED <http://www.w3.org/2000/10/swap/log.rdf>
> {
>   GRAPH ?g
>   {
>     log:semantics rdfs:comment ?definition ;
>         rdfs:domain ?domain ;
>         rdfs:range  ?range ;
>         rdfs:label  ?label .
>   }
> }
>
>
> which to save you the trouble of executing that query, the N3 version says:
>
> log:semantics a rdf:Property;
>    rdfs:domain doc:Work;
>    rdfs:range  log:Formula;
>    rdfs:label  "semantics";
>    rdfs:comment """The log:semantics of a document is the formula.
> achieved by parsing representation of the document.
>  For a document in Notation3, log:semantics is the
> log:parsedAsN3 of the log:contents of the document.
> For a document in RDF/XML, it is parsed according to the
> RDF/XML specification to yield an RDF formula
> (a subclass of N3 log:Formula).
>
> [Aside: Philosophers will be distracted here into worrying about the meaning
> of meaning. At least we didn't call this function "meaning"!
> In as much as N3 is used as an interlingua for interoperability
> for different systems, this for an N3 based system is the meaning
> expressed by a document.]
>
> (Cwm knows how to go get a document and parse N3 and RDF/XML
> it in order to evaluate this.
> Other languages for web documents
> may be defined whose N3 semantics are therefore
> also calculable, and so they could be added in due course.
> See for example GRDDL, RDFa, etc)""".

The existence of log:semantics at least lets us try to pose a question:

Does log:semantics act as an owl:FunctionalProperty?  i.e. within a
single graph, can we expect at most one true property value for it?

People seem to talk as if it is functional, but I can't see that
working out in practice.

Dan
Received on Thursday, 15 December 2011 21:30:19 GMT

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