- From: Dan Connolly <connolly@w3.org>
- Date: Thu, 12 May 2005 09:36:49 -0500
- To: Stephane Fellah <stephanef@imagemattersllc.com>, public-rdf-dawg-comments@w3.org
Your message of 20 Apr continues... http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/2005Apr/0038.html > ISSUE 3: DESCRIPTION OF SUPPORTED FUNCTIONS IN SPARQL PROTOCOL. > > The SPARQL <http://www.w3.org/TR/rdf-sparql-protocol/> Protocol for RDF > document is not clear how the ServiceDescription describes the supported > functions and operations by the SPARQL Service. > > For client operations, it is important not only to know the URI of the > functions and operations but also to get a description of their arguments > types, cardinality and order. Hmm... it's clear to me that a client might recognize the URI of an extension function, and hence know its purpose/functionality, as well as its signature (arg types etc). It's hard for me to imagine a client that can dynamically make use of just the signature information. Can you give an example, please? In any case... > An additional optional query type could be added to describe Functions and > Operands such GetOperationDescription and takes an optional parameter name > which can take a list of operand or function uri, > > http://www.foo.com/sqs?query=GetOperationDescription&name=http://my.example. org/geo/functor#WithinDistance, http://my.example.org/geo/functor#Intersects > > The response should be in RDF format. This assumes an ontology for functors > and operands needs to be elaborated. Do you have a design for such an ontology handy? The WG has not discussed service descriptions that go into that level of detail. > In conclusion, I would like the DAWG elaborates more the section 11.3 of the > current SPARQL Query Language for RDF document, because I anticipate many > user-defined functions would be defined in the future. OK, yes, stay tuned for future drafts. We're working on it. -- Dan Connolly, W3C http://www.w3.org/People/Connolly/ D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E see you at XTech in Amsterdam 24-27 May?
Received on Thursday, 12 May 2005 14:36:59 UTC