[xsl] xalan extention - evaluate()

[Andrey Solonchuk <solo@xxxxxxxxxxxxxx>]

Hello All,

I now try using xalan extentions
and couldn`t understood how to using
evaluate()

what does they mean writing
* "implemented in org.apache.xalan.lib.Extensions,
* evaluate (xpath-expression) function returns the result
* of evaluating the xpath-expression in the current XPath
* expression context (automatically passed in by the
* extension mechanism).
* Use the evaluation extension function when the value
* of the expression is not known until run time.

may be somebody can explain this or illustraite in small example

Thanks
Andrey Solonchuk
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