Re: if child element does not exist stop generation

        Error:sequence missing <length> child!


that is not well formed XML you need to close (or escape) the length
element.

     [java] [Fatal Error] interface.xsl:478:11: Element or attribute do not match QName production: QName::=(NCName':')?NCName. 

That says something else (that you haven't shown) isn't a legal element
or attribute name in sone place where a name is required.

You also meant to test  <xsl: if test="not(length)"> I assume as the
code you show generates an error message about a missing length if there
is a length element.

David


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