Re: Xalan C++ document() tech question

[Joseph Kesselman]

>Could someone tell me how/when/where the "document()" XSLT function
>actually happens...

The FuncDocument class currently implements this. Note that it's basically a call to DTMManager's getDTM operation.

The current implementation of DTMManager does perform some caching, so if you're repeatedly accessing the same document within a single transformation, I _think_ we will simply re-access the same DTM.

If you want to do some explicit caching, the easiest approach would be to assign the retrieved document to an XSLT variable and then use the variable, possibly via our provided nodeset() extension function.

(It's worth noting that the current working draft for XSLT2 removes the need for that extension; the current plan is that it will allow you to directly search variables containing "temporary trees".)

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Joe Kesselman / IBM Research