How to indicate 'missing' tags in XQuery?

Posted by Stewart on Stack Overflow See other posts from Stack Overflow or by Stewart
Published on 2010-03-28T17:36:19Z Indexed on 2010/03/28 17:43 UTC
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I have an XML file:

$xml := <xml>
          <element>
              <text>blahblah</text>
          </element>
          <element>
          </element>
          <element>
              <text>blahblah</text>
          </element>
      </xml>

I can use the query

for $x in $xml/xml/element/text return string($x)

This gives me a list

blahblah
blahblah

with no indication that there is an element which has no element. What I'd like to do is use a query which, if there is no such element, returns, say "missing". How do I do this?

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