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[OK?] Re: SPARQL: isURI poorly named

From: Eric Prud'hommeaux <eric@w3.org>
Date: Tue, 8 Nov 2005 09:12:03 -0500
To: Bjoern Hoehrmann <derhoermi@gmx.net>
Cc: public-rdf-dawg-comments@w3.org
Message-ID: <20051108141203.GC412@w3.org>
On Tue, Nov 08, 2005 at 08:57:32AM -0500, Eric Prud'hommeaux wrote:
> On Mon, Aug 01, 2005 at 08:14:40PM +0200, Bjoern Hoehrmann wrote:
> > 
> > * Eric Prud'hommeaux wrote:
> > >I don't follow. Is it the "IRI" part or the "is" part that you object
> > >to? (Perhaps this is in the context of preferring the spec to refer to
> > >URI refs instead of IRIs.)
> > 
> > Well, CSS has url(), XML DSig has URI="", if SPARQL uses isIRI() it's
> > probably just a matter of time until we agree on yet a different term
> > for resource identifiers in which case the name becomes obsolete and
> > we'd have to deal with yet more confusion. Names that omit reference
> > to the current terminology would avoid this problem, e.g. isRI, isRe-
> > source, etc. would all work for me, but the WG probably knows best
> > what'd be a good replacement.
> 
> I'm not sure there's a "right" answer here. The WG wrestled with
> current practice and a few issues like URI vs. IRI, and what do people
> understand by "resource". The RDF precedent is that everything is a
> resource. We decided to offer two spellings for the test, "isIRI" and
> "isIRI". The relevent text is scattered through the document:
> 
> Table 11.1 Operator Mapping [OM]
>   isIRI(A)	RDF term	sop:isIRI(A)	xsd:boolean
>   isURI(A)
> 
> 11.2.3.2 sop:isIRI [IS]
>   xsd:boolean   isIRI (Rterm term)
>   Returns true if term is a URI. Returns false otherwise.

Sorry, old text. Please consider this text for the definition of
isIRI:

11.2.3.2 sop:isIRI

 xsd:boolean   isIRI (Rterm term)
 xsd:boolean   isURI (Rterm term)

  Returns true if term is an IRI. Returns false otherwise. isURI is an
  alternate spelling for the isIRI operator.

  @prefix foaf:       <http://xmlns.com/foaf/0.1/> .
  _:a  foaf:name       "Alice".
  _:a  foaf:mbox       <mailto:alice@work.example> .
  _:b  foaf:name       "Bob" .
  _:b  foaf:mbox       "bob@work.example" .

  This query matches the people with a name and an mbox which is an IRI:

  PREFIX foaf: <http://xmlns.com/foaf/0.1/>
  SELECT ?name ?mbox
   WHERE { ?x foaf:name  ?name ;
              foaf:mbox  ?mbox .
           FILTER isIRI(?mbox) }

  Query result:
     name               mbox
    "Alice"  <mailto:alice@work.example>


> Grammar [GM]
> [52] BuiltInCall ::= 'STR' '(' Expression ')'
>                    | 'LANG' '(' Expression ')'
>                    | 'LANGMATCHES' '(' Expression ',' Expression ')'
>                    | 'DATATYPE' '(' Expression ')'
>                    | 'BOUND' '(' Var ')'
>                    | 'isIRI' '(' Expression ')'
>                    | 'isURI' '(' Expression ')'
>                    | 'isBLANK' '(' Expression ')'
>                    | 'isLITERAL' '(' Expression ')'
>                    | RegexExpression
> 
> If this text meets your requirements, please respond with [CLOSED] in
> the subject to allow the issue tracking scripts to close this issue.
> 
> [OM] http://www.w3.org/2001/sw/DataAccess/rq23/#OperatorMapping
> [IS] http://www.w3.org/2001/sw/DataAccess/rq23/#func-isIRI
> [GM] http://www.w3.org/2001/sw/DataAccess/rq23/#rBuiltInCall



-- 
-eric

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Received on Tuesday, 8 November 2005 14:12:15 GMT

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