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   Re: [xml-dev] XPath and XPattern (was Re: [xml-dev] More on tamingSAX)

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Karl Waclawek wrote:

> 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.

This sounds too processing-model-specific.  I guess I started it by 
saying "parent stack".  Permit me to amend that to "ancestor axis".

I don't think that in a spec that is supposed to be cross-platform, 
cross-platform, cross-toolkit, we can get away with specifying things in 
terms such as "put a hook here".  We'd have to define context in a 
similar way to XPath's definition (though more restricted, naturally).

Uche Ogbuji                                    Fourthought, Inc.
http://uche.ogbuji.net    http://4Suite.org    http://fourthought.com
Use CSS to display XML - http://www.ibm.com/developerworks/edu/x-dw-x-xmlcss-i.html
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Be humble, not imperial (in design) - http://www.adtmag.com/article.asp?id=10286
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Default and error handling in XSLT lookup tables - http://www.ibm.com/developerworks/xml/library/x-tiplook.html
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