- From: Seaborne, Andy <andy.seaborne@hp.com>
- Date: Thu, 17 Feb 2005 19:13:28 +0000
- To: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Today, some of us were puzzling over boolean expressions in XQuery/Xpath and how they affect SPARQL. We think that the "boolean effective values" rules apply in constraints and I have checked in some tests into tests/data/Expr2 for this. "boolean effective values" reference: http://www.w3.org/TR/xquery/#dt-ebv and it means that: "AND ?x" is legal. ?x is true if the value of ?x is: * boolean and the value of the boolean is true * a string and length(string) > 0 * a numeric: number != NaN && number != 0 Anything else is "type error" which means the whole solution is rejected. Andy
Received on Thursday, 17 February 2005 19:14:23 UTC