generating XSL errors

[Stephen Kirkham <skirkham@xxxxxxxxxx>]

I am combining 2 XML documents using a single XSL script. IF I detect an
error in one of the documents, e.g. an expected element is missing, I want
to generate an error/exception that is passed back to the Java program
running the XSLT processor ( Xalan ).How do I generate the error, I would
like to avoid extensions if possible, but if that is the only way its ok

thanks


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