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   RE: [xml-dev] Co-operating with Architectural Forms

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> From: Michael Kay [mailto:michael.h.kay@ntlworld.com]


> I think the number of cases where you can do this 
> automatically is rather limited, though it might become 
> rather more feasible if the optimizer has knowledge of the 
> schema. It only takes a single template that uses "..", or a 
> leading "//", or <xsl:number/>, or key(), or various other 
> things, to make the optimization invalid, unless you know for 
> certain that these are only selecting within the current subtree.

What if you avoid such constructs? What if all your expressions only select
along the child and attribute axes -- are existing XSLT engines (SAXON, for
instance) smart enough to optimize for that and not try to hold the entire
document structure in memory?


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