Trying to use namespaces in xpath expressions within servicemix-drools
doesn't seem to recognize the namespaces. I saw a bug fix was made for this
in 3.1 but still doesn't seem to work for me. 

for example XML:

<invoice xmlns="urn:my:ns">
  <item>
    <name>Pen</name>
    <quantity>10</quantity>
  </item>
  <item>
    <name>Paper</name>
    <quantity>100</quantity>
  </item>
</invoice>


Drools file
router.drl

rule test
     when 
            $me : Exchange(status == Exchange.ACTIVE, $in : in != null)
           
eval($in.xpath("/invoice[namespace-uri='urn:my:ns']/item[1]/quantity > 5")
     then 
...


this evaluation returns false, but if I remove the namespace from the XML
and replace the eval with the following it returns true, as expected.

eval($in.xpath("/invoice/item[1]/quantity > 5")


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