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Statements in queries?

From: Danny Ayers <danny.ayers@gmail.com>
Date: Sun, 12 Jun 2005 09:47:41 +0200
Message-ID: <1f2ed5cd050612004728960a1b@mail.gmail.com>
To: public-rdf-dawg-comments@w3.org

I re-skimmed the spec, couldn't see a way of doing this, and the
charter, couldn't see an exclusion. Something that may be useful, if
there's an uncomplicated way of doing it.

Basically I'd like to somehow pass a statement(s) from the query to
the results. The use case is I want to select a group of people, and
have that group labelled in the results. The label isn't in the
triplestore, it's something I want to add at query time. The
triplestore will not be affected, this isn't graph update.

I realise I could include the label or whatever in XSLT, but for the
app I'm working on it would be much more convenient to have the XSLT
fixed, with the query generated dynamically.

It seems to me that for my specific kind of application a
pseudo-statement could work, something like:

?label  VALUE "dawg" .

producing 

<result>
    <label>dawg</label>
...

at the appropriate places.

But I wonder whether this might be more usefully done as assertions in
the query, with the RDF results going something like this -

data:
<#groupA> rdf:type my:Group . 
<#groupB> rdf:type my:Group .

query:
?group rdf:type my:Group .
?group my:label ?label .
APPEND ?label rdf:value "dawg" . 

results:
<#groupA> rdf:type my:Group .
<#groupA> my:label "dawg" .
<#groupB> rdf:type my:Group .
<#groupB> my:label "dawg" .

Cheers,
Danny.

-- 

http://dannyayers.com
Received on Sunday, 12 June 2005 07:47:45 GMT

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