- From: Holger Knublauch <holger@topquadrant.com>
- Date: Thu, 5 Mar 2009 10:49:44 -0800
- To: public-rdf-dawg-comments@w3.org
Received on Thursday, 5 March 2009 18:50:29 UTC
Dear SPARQL working group, TopQuadrant (W3C member) strongly supports the proposed Assignment feature [1]. In particular we have many customers who rely on the ability to construct new RDF nodes (literals and URIs) as part of CONSTRUCT rules. Use cases include ontology mapping and deriving new values from existing ones. The LET keyword implemented by Jena/ARQ [2] has proven to be an excellent solution for those tasks, and leads to very readable queries. Example: # Computes area := width * height CONSTRUCT { ?this :area ?area . } WHERE { ?this :width ?width . ?this :height ?height . LET (?area := (?width * ?height)) . } Regards, Holger [1] http://www.w3.org/2009/sparql/wiki/Feature:Assignment [2] Assignment in ARQ
Received on Thursday, 5 March 2009 18:50:29 UTC