Seeking XPATH

Hi All,

Suppose an XML DOM containing something like

<ROOT>

<A>
  <B NM="case1">abc</B>
  <B NM="case2">xyz</B>
   ---
</A>

<A>
  <B NM="case3">abc</B>
  <B NM="case4">def</B>
   ----
</A>

<A>
  <B NM="case5">lmn</B>
  <B NM="case6">qrs</B>
   ----
</A>

</ROOT>

Can someone propose an XPATH expression that will find 'A' nodes that have
'B' nodes with matching attribute values?  In the above data data, such an
expression would match the first two A nodes because in first A - A/B[@NM =
"case1"] has the same node value as the second A's A/B[@NM = "case3"].  Each
has the value 'abc'.

Thanks for your help.

Cordially,

Paul


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