check for optional element

Hi,

I want to check if an optional element is present in my XML document and 
if so I want to react to this fact. For example I have an optional 
element subsidiary in my Organesation.xml. If a subsidiary is present I 
want to create an additional column in my HTML table. How could I 
realise this test. The element-available() function does only apply to 
instruction elements I think?!
Best regards,

Nick



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