- From: Steve Harris <S.W.Harris@ecs.soton.ac.uk>
- Date: Mon, 15 Aug 2005 11:05:13 +0100
- To: DAWG public list <public-rdf-dawg@w3.org>
I now have a crude implementation of ORDER BY, but I'm finding the arbitrary ordering specified in the language spec. a bit inconvientient. For example, if you have: SELECT ?v WHERE { ?x rdf:value ?v . FILTER(datatype(?v) = xsd:decimal) } ORDER BY DESC(?v) LIMIT 10 you might hope to get the highest v's back, but to my reading of the spec you will get back the one with the most 9s at the start, or something similar, as the ordering is lexical. One way to get that might be allow casting in the ORDER BY constraint (ORDER BY DESC(xsd:decimal(?v)), but that adds complexity, and I'm not a fan of that. Another would be to relax the constraints on what the order must be (eg, to just ensuring that its consistant), to allow the implementations to do something sensible. The current spec. seems to lead you to something which is quite complicated to implement, but the complexity doesn't add much capability. - Steve
Received on Monday, 15 August 2005 10:05:53 UTC