- From: Seaborne, Andy <andy.seaborne@hp.com>
- Date: Sun, 15 May 2005 17:48:35 +0100
- To: Dan Connolly <connolly@w3.org>
- Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Dan Connolly wrote: > I'm working on sparcli.py , playing with various > services out there; one of the options is... > > elif '--sparqlette' in sys.argv: > BG='data' > svcAddr = > 'http://www.wasab.dk/morten/2005/04/sparqlette/?format=xml&' > > i.e. I'm trying to look at the SPARQL interface as something > that doesn't have a format= param, but sparqlette has > a format param, so I'm trying to "hide" it in the service > address. Could do - there is also format information using the "accept". > > That works for SELECT and ASK, but not for CONSTRUCT. > > I'm starting to wonder if ?query=... should be > separated into ?select=... and ?construct=... or > something. > > And the special-case for ASK in the results format > feels wierd. I'd rather use the degenerate form of > the general case: zero results for false, and > one result with zero bindings for true. But I guess > we're decided on that (indeed... > http://www.w3.org/2001/sw/DataAccess/ftf4.html#item11 ) > and I don't have much in the way of new information. > > Just thinking out loud. > > for ref... > http://www.w3.org/2001/sw/DataAccess/proto-wd/sparcli.py > 1.5 now > There is a tradeoff for simple clients. If there are separate interfaces for different operations, then it requires the client library to send different things for the various result forms - and so the client library needs to know at the point the request is made. So it needs to understand SPARQL query strings (at some level - need not be complete parsing) or it would require the API to get the application to tell the client library what to do. With one interface, a simple client could written that does not need to parse the query string. The most basic is send query string to a service. It's the results that need the information - our result form, for example, enumerates the variables in the header making subsequent parsing streamable. Works if you can tell RDF/XML from XML result sets, like "accept" processing. Andy
Received on Sunday, 15 May 2005 17:22:12 UTC