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Re: [xsl] fn:document() cost

2018-02-11 17:31:00
The only way you can get definitive answers to performance questions is by 
measuring it, but I would expect that combining several documents into one 
would increase your costs rather than decreasing them.

Because multiple calls on document() with the same URI are required to return 
identical nodes (in the sense of the XPath "is" operator) XSLT processors don't 
have much choice but to cache the result in memory in case the same URI is used 
again.

Michael Kay
Saxonica


On 11 Feb 2018, at 23:03, Jacopille, David djacopille(_at_)mfs(_dot_)com 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

XSL experts,
 
I have to pull from several xml files.  Would it be more efficient to combine 
all the xml into a single file first…or use fn:document() to specify the 
document context for each xpath statement.
 
If Saxon's complier is savvy about only loading a document once in an XSL 
that specifies the same document multiple times this approach seems 
preferable to me.
 
Thanks,
Dave Jacopille
Boston, MA
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