Selecting distinct values from different node in XPATH 1.0

Hi Experts,
          I have to get the list of the distinct attribute values across
different node level. To help you understand my requirement, i am herewith
listed with a sample XML file

My XML file looks like this

<validation>
 <report>
   <script city="NY">
          <case name="ramesh" status="BE"/>
          <case name="rajesh" status="B.Com" />
   </script>
   <script city="AL">
          <case name="ramesh" status="Law" />
   </script>
 </report>
</validation>

Now i have to get only the values as ramesh and rajesh and i should not get
ramesh two times. As i use only XPATH 1.0 and XSLT 1.0 i cannot use
distinct-values function. I earlier tried using to fetch distinct values to
a variable using the below script in xslt and it is not working.

<xsl:variable name="uniquevalues"
select="/validation/report/script/case[not(@name=predicate-sibling::validation/report/script/case/@name)]/@name"
/>

The above code snippet is not working. Kindly let me know what has to be
done to get my expected output.


thanks in advance,
npselvan
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