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help with schematron (axis in pattern must be child or attribute)


I have a question about Schematron.  I don't know if this is a suitable forum, but it's worth a shot.

I have an XML file with certain elements with an attribute that can take one of a set of values.  That set, however, change depending upon the position of the element.  Here's a simplified sample:

  <!-- the 1st matching element -->
  <element match="true" value="one"/>
  <element match="false">
    <element match="false">
     <!-- the 2nd matching element -->
      <element match="true" value="two"/>
  <element match="false/>
  <!-- the 3rd matching element -->
  <element match="true" value="three/>

I've been playing with XPath and the following expression will match all of the appropriate elements:


I can narrow this down by adding "[position()=n]" and then check in an <assert> that @value is one of the allowable terms.

In order to ensure that I don't miss out on any _nested_ elements (as with number 2 above) - the matching elements could be absolutely anyplace in the document - I search all descendants of the root element.

However, the above expression generates an error: "axis in pattern must be child or attribute". 

Does anybody have any ideas on how to solve this?

Many thanks for your help

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