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Re: [xsl] Creating keys depending on input parameter

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Hi Bob,
i guess, when you declare an instruction <xsl:key at
the <xsl:stylesheet level, it is an instruction to the
XSLT processor to maintain an index for the key
operation. When you actually use the key() function,
it returns the node-set corresponding to the arguments
to key() function(at which time the processor must be
consulting the <xsl:key definition).

i am not sure about the internals of polular XSLT
processors namely Xalan and Saxon. If the XSLT
processor creates the data structures in memory to
manage the key when it encounters the <xsl:key
definition, then its an overhead which you are not
wanting(in cases you are not using the key()
function). If the processor *can* create the data
structures for key operation in memory, when it
*first* encounters the key() function in stylesheet,
you may achieve the optimization you are desiring(i
guess processors don't do that!). If you are not able
to use the <xsl:key statement based on some
parameter(i guess we can't), i think you will have to
bear the overhead associated with using the key in
your situation.


Regards,
Mukul


--- Bob Stobie <bstobie@xxxxxxxxxx> wrote:
> Hi All,
> 
> I have an application where I use the same XSL file
> in several different
> ways, depending on input parameters.  In one case I
> would like to create
> keys to access the data, but I don't want to incur
> the overhead of the key
> creation unless I actually need them.  I would like
> to control this by the
> input parameters, but there doesn't seem to be any
> way to do that.  The key
> command has to be at the stylesheet level, it can't
> be in a template.  On
> the other hand, if and choose must be in a template,
> and cannot be at the
> stylesheet level.
> 
> Anyone have any suggestions?
> 
> Bob Stobie
> bstobie@xxxxxxxxxx
> 
> 
>  XSL-List info and archive: 
> http://www.mulberrytech.com/xsl/xsl-list
> 


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