Re: Suggestions for DQL changes made at Portland

From: Deborah McGuinness (
Date: 10/27/02

  • Next message: Richard Fikes: "Re: Suggestions for DQL changes made at Portland"
    Removing the may-bind variables seems like a nice side-effect simplification
    of the proposal.
    (we have had a few questions about them anyway when explaining this scheme
    to users).
    Richard Fikes wrote:
    > > 4. Answer templates.
    > >
    > > A query must supply an answer template, which is a character string
    > > (?? Piece of DAML?? I prefer the more generous definition) containing
    > > some of the variables in the query pattern. If no answer template is
    > > explicitly provided, then the query pattern is the default answer
    > > template (Sandro's idea).
    > The answer template interacts with the must-bind variables list and the
    > may-bind variables list.  We need to make some design decisions about
    > that interaction.  We could say that the variables in the answer
    > template *are* the may-bind and must-bind variables, and then that a
    > query can optionally include a must-bind variables list indicating which
    > of the variables in the answer template must have a binding in an
    > answer.  There would then be no need for a may-bind variables list.
    > That would remove redundancy from the query, but would require more work
    > by the server.  ...
    > Richard
     Deborah L. McGuinness
     Knowledge Systems Laboratory
     Gates Computer Science Building, 2A Room 241
     Stanford University, Stanford, CA 94305-9020
     (voice) 650 723 9770    (stanford fax) 650 725 5850   (computer fax)  801
    705 0941

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