Validating XPath queries

Hi,

  Does anyone know of a tool that validates XPath queries against XML 
schemas?  For a given schema, a query is valid if there exists a document 
valid in the schema for which the query returns at least one result.

   I've seen mention on this list of XPath somehow incorporated into 
XML Scheme 1.1.  Does that capability obviate the value of such a 
tool?

-- Paul
--
Paul Steckler
National ICT Australia
paul DOT steckler AT nicta.com.au