From: Mike Dean (mdean@bbn.com)
Date: 03/10/03
Several questions related to DQL: During the query discussions at the W3C meetings last week in Boston, I realized that we never officially published an updated DQL [1] specification addressing the feedback (answer templates, etc.) from the October DAML PI Meeting. Should we try to publish an update before the April PI Meeting? A use case also came up that I don't believe DQL can clearly cover. Suppose we have a knowledge base containing contact information (name, phone, emailAddress, etc.) for individuals. A given individual may or may not have an instantMessageAddress. Can we write a single DQL query that retrieves name, email, and the instantMessageAddress only if present? Does this require some mechanism for indicating that a statement is optional, or can it just be handled using a may-bind variable for the object of the instantMessageAddress statement? There appears to be significant interest in forming some sort of W3C Semantic Web Query Working Group. Should we try to publish DQL as a W3C Note that can be more easily used as an input to such a group? It would probably be best if such a note included a concrete syntax. Mike [1] http://www.daml.org/dql/
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