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Re: XPath 1.5? (was RE: typing and markup)

• To: jeni@j...
• Subject: Re: XPath 1.5? (was RE: typing and markup)
• From: David Carlisle <davidc@n...>
• Date: Wed, 8 May 2002 13:57:52 +0100
• Cc: xml-dev@l...
• In-reply-to: <81394006465.20020508130430@j...> (message from JeniTennison on Wed, 8 May 2002 13:04:30 +0100)
• References: <<5.1.0.14.0.20020507100109.04decec0@n...><5.1.0.14.0.20020507100109.04decec0@n...><5.1.0.14.0.20020507112929.04dfc880@n...><01e101c1f671$c9e15650$4bc8a8c0@A...><015201c1f681$fcdadb20$0301a8c0@n...><200205081127.MAA23277@p...> <81394006465.20020508130430@j...>

> Since this is compile-time assessment of the expressions in the
> stylesheet, I think that the answer is to not import a schema to the
> stylesheet in the first place,

Well yes, but that answer's the same as Jonathan's.  If someone argues
that supporting schema complex types, bloats the spec, complicates the
use of the language, and provides lots of undesirable side effects.
Being told that you can use Xpath/XSLT without using that feature is
I suppose better than nothing, but hardly a justification for the schema
complex type support being there in the first place.

> I can't see anything in the XSLT 2.0 WD that says that, during
> compilation, it will access a particular instance document's schema
> and use that to optimise queries.

Neither could I actually, but this so far has been the only
justification offered for the provision of strong typing based on schema
complex types, so if it is Xquery only, what's it doing in Xpath?


> If a processor substituted aaa/bbb for the empty sequence on
> the assumption that the source document was completely valid, there
> would be a rather strange situation where the data model contained an
> element that was inaccessible from the stylesheet.

You say it's strange, and I agree, but neither of us are on the WG,
It's hard to understand how the argument that the type system allows
compile time optimisation (if it is true) can fail to lead to this
strange situation.

David

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• Follow-Ups:
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: Jeni Tennison <jeni@j...>

• References:
  • RE: XPath 1.5? (was RE: typing and markup)
    • From: Jonathan Robie <jonathan.robie@d...>
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: Jonathan Robie <jonathan.robie@d...>
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: "Rick Jelliffe" <ricko@a...>
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: "Jonathan Borden" <jborden@a...>
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: David Carlisle <davidc@n...>
  • Re: XPath 1.5? (was RE: typing and markup)
    • From: Jeni Tennison <jeni@j...>

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