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Document or sequence

From: Norman Walsh <Norman.Walsh@Sun.COM>
Date: Thu, 15 Mar 2007 16:31:13 -0400
To: public-xml-processing-model-wg@w3.org
Message-ID: <87veh2qmem.fsf@nwalsh.com>
|    Mohamed: I'm concerned about the consistency of viewport-source,
|    iteration-source, and xpath-source.
|    ... I don't find the explanation about why some are one way and some are
|    not very clear.
|    ... I think sequences are just not very clear at a deep level.

I think the rationale is this:

1. We decided that components do not do iteration implicitly. You
   can't send a sequence of documents to a component that only accepts
   a single document expecting it to process each document in turn.

2. A for-each component is designed to iterate over sequence, so it
   has to accept a sequence.

3. A viewport component takes a single document so it can't take a
   sequence (see point 1).

4. I don't believe that XPath 1.0 defines the semantics of applying an
   XPath expression to a sequence of documents, so xpath-context can't
   take a sequence.

Does that help at all?

                                        Be seeing you,

Norman Walsh
XML Standards Architect
Sun Microsystems, Inc.

Received on Thursday, 15 March 2007 20:32:42 UTC

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