[XPath] matching elements which satisfy a specific content model

Hi

I need to match a variablelist containing:

  1. An optional title element,
  2. after this, one or more varlistentry elements.

  <t:template match="variablelist[...]">
                                  ^^^
How to write

  title?, varlistentry+

in XPath?

I think I'm missing something obvious. If it's very simple, then I'm 
happy :)
Else I think it would be great to have something like content-model():

  <t:template
   match="variablelist[content-model(title?,varlistentry+)]">

Tobi

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