• To: <michael.h.kay@n...>,"'Jeni Tennison'" <jeni@j...>
• Subject: RE: XPath 1.5? (was RE: typing and markup)
• From: Jonathan Robie <jonathan.robie@d...>
• Date: Thu, 09 May 2002 07:16:38 -0700
• Cc: <xml-dev@l...>
• In-reply-to: <000801c1f75e$5633daf0$6501a8c0@pcukmka>
• References: <5.1.0.14.0.20020508075809.048c7e98@n...>

At 02:35 PM 5/9/2002 +0100, Michael Kay wrote:

>All this goes to prove that there is scope for plenty of PhD theses on
>XPath/XQuery optimization. I think it's obvious that there are optimizations
>that can be done with knowledge of the schema that can't be done without,
>but exactly what those optimizations are is still a matter for research.

Absolutely. And implementations will do much better in 3 years than they 
will in 1 year.

What will be the relative impact on speed of type-based optimization versus 
other kinds of optimization? The jury is still out. There are certainly 
examples where type-based optimization looks very promising. The type 
information is available in the schema. Vendors should be able to use this 
information in optimization.

Jonathan

• 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: "Michael Kay" <michael.h.kay@n...>

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