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RE: XQuery and DTD/Schema?

• To: <bill.dehora@p...>, <xml-dev@l...>
• Subject: RE: XQuery and DTD/Schema?
• From: Bill de hÓra <bill.dehora@p...>
• Date: Mon, 8 Jul 2002 17:18:21 +0100
• Importance: Normal
• In-reply-to: <000201c22693$6ecf90e0$c1c8c8c8@mitchum>
• Organization: Propylon
• Reply-to: <bill.dehora@p...>

> -----Original Message-----
> From: Bill de hÓra [mailto:bill.dehora@p...] 
>
> > -----Original Message-----
> > From: Michael Kay [mailto:michael.h.kay@n...]
> >
> > If the query is
> > 
> > employee[salary > 100000]
> > 
> > then to use an index on salary, at the very least you have to know 
> > that the index was built using the same assumptions about the ">" 
> > operator as the query is using. So some kind of static analysis is 
> > necessary. And some of the characteristics of the XPath 1.0 dynamic 
> > typing rules (which say, for example that "1.0" = "1" is false, but 
> > "1.0" <= "1" is true) become a major embarassment.
> 
> [...]
> 
> And if we allow operator overloading to spanner the query 
> semantics in the first place, I'm not wholly sympathetic to 
> demands for static typing as a workaround.

Contrariwise, if operator overloading /is/ part and parcel of XQuery and
is in itself an important thing to have, then static analysis makes
sense.

Bill de hÓra

..
Propylon
www.propylon.com 

 

• References:
  • RE: XQuery and DTD/Schema?
    • From: Bill de hÓra <bill.dehora@p...>

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