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Re: Can XML Schemas do this?

• To: "Bryce K. Nielsen" <bryce@s...>
• Subject: Re: Can XML Schemas do this?
• From: "Chiusano Joseph" <chiusano_joseph@b...>
• Date: Mon, 20 Jan 2003 16:50:43 -0500
• Cc: XML DEV <xml-dev@l...>
• Organization: BAH
• References: <1043073881.11126.1.camel@m...> <1043074446.3479.47.camel@ibook> <005301c2c0cc$c7257f60$34121eac@beakon>

> Why do the schema languages care about the particular
> order of the XML nodes? 

This may be important if parsing an XML document using DOM - for
example, one may want to "place" elements that are always/often accessed
(such as primary key values in relational database terms) near the top
of an XML document, or near the top of a content model within an XML
document for performance purposes.  (But since a tree for the entire
document needs to be built anyway, this may not buy you much in terms of
performance - just thinking out loud).

Joe Chiusano
Booz | Allen | Hamilton

"Bryce K. Nielsen" wrote:
> 
> > 1) Use another schema language (Relax NG does this very well) instead of
> > W3C XML Schema.
> >
>  I'm somewhat new to Relax NG, but reading through it's primer doc it
> appeared that the Order of the Elements was also strictly governed by the
> schema (in other words, you can't do this in RelaxNG either). Which brings
> the question, WHY? Why do the schema languages care about the particular
> order of the XML nodes? I can see the advantages of having this as an option
> (i.e. something like <sequence order="fixed"> or something) but to make it a
> requirement seems to backwards for most XML usages.
> 
> -BKN
> 
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• References:
  • Can XML Schemas do this?
    • From: Brian Burridge <maillist@b...>
  • Re: Can XML Schemas do this?
    • From: Eric van der Vlist <vdv@d...>
  • Re: Can XML Schemas do this?
    • From: "Bryce K. Nielsen" <bryce@s...>

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