How to check if a file exists

Hi!
This question has already been asked:

>> I'm using xt ....
>> 
>> Is there a way to check if a file, any file not neccessarily and xml file,
>> exists through xsl?
>
>You will need to call a Java File routine.  I don't recall the details
>offhand, but between XT's documentation and the Java API docs (e.g., for
>JDK 2, http://java.sun.com/products/jdk/1.2/docs/api/index.html) it
>shouldn't be hard to figure out.  At least you won't need to write the
>routine.

but I still don't know what to do.
Can somebody copy a part of code, please?
Thanks

Carsten


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