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Re: XPath and XPattern (was Re: More on tamingSAX)

• To: Uche Ogbuji <Uche.Ogbuji@f...>
• Subject: Re: XPath and XPattern (was Re: More on tamingSAX)
• From: Karl Waclawek <karl@w...>
• Date: Fri, 24 Dec 2004 00:36:21 -0500
• Cc: David Megginson <david.megginson@g...>,xml-dev@l...
• In-reply-to: <1103865539.16585.12.camel@borgia>
• References: <E1ChXnb-0004PJ-00@u...> <41CB29FA.8010201@t...> <75cb920c041223124846b805a9@m...> <1103865539.16585.12.camel@borgia>
• User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

Uche Ogbuji wrote:

>>There's also the question of context -- would the only context be the
>>stack, or do people hope to have access to left siblings as well?
> 
> 
> I'd say only the parent stack, or shallow but very wide documents become
> resource hogs.  An extension mechanism could allow implementations to
> support sibling access, or perhaps that would be a matter of conformance
> levels (a la DOM or XAPI).

Why not leave this to the application to decide.
Just provide a hook for accessing context, but
don't make a decision what to provide.
Providing these hooks just on the parent stack
should be sufficient, because at the parent level
one can aggregate context as needed.

I have found that even transformations that
require some backward navigation can be done
using a streaming approach.
Even for a document where the first line of output
needs to process the last line of input you often do
not need to build a complete DOM.

Karl

• Follow-Ups:
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Uche Ogbuji <uche.ogbuji@f...>

• References:
  • RE: XPath and XPattern (was Re: More on taming SAX)
    • From: "Michael Kay" <mike@s...>
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Oleg Tkachenko <oleg@t...>
  • Re: XPath and XPattern (was Re: More on taming SAX)
    • From: David Megginson <david.megginson@g...>
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Uche Ogbuji <Uche.Ogbuji@f...>

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