In this case, you might also write your function to emit some
kind of error condition if the incoming string is not in the
right form.
You can always do <xsl:message terminate="yes">.
One thing I've done occasionally is to define a union type that allows
xs:date or **error** as its member types. That's a bit cumbersome though.
Really, XSLT needs a proper exception handling mechanism built in to the
language.
Michael Kay
http://www.saxonica.com/
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