Xpath and namespace, select node iterator

Xpath and namespace, select node iterator

I have this kind of XML:
<?xml version="1.0" encoding="UTF-8"?>
<documentAnswer xmlns="http://schemas.pkh.hr/doc/2013/documents/rda_30"
domainName="rda" domainVersion="3.0">
<answerTimestamp>2013-08-21T13:35:25.894</answerTimestamp>
<correct>
<docId>RDA2_29F81D27-1409BE49E2E-7FF8</docId>
<attachments>
<attachment>
<format>application/pdf</foraat>
<generatedType>StampanNaBlanko</generatedType>
<encodedPdf>JVBERiYKJSVFT0YK</encodedPdf>
</attachment>
</attachments>
</correct>
Those attachment tags can be one or more. I am trying to get NodeIterator
of attachment tags in java using
XPathAPI.selectNodeIterator(node,
"/documentAnswer/correct/attachments/attachment")
and then iterate, but I am not succeeding. I am guessing that problem is
in xpath and that it is related to namespace, but don't know how to solve
it. I tried with this kind of xpath but no success:
XPathAPI.selectNodeIterator(node,
"/rda:documentAnswer/correct/attachments/attachment", "rda",
"http://schemas.pkh.hr/doc/2013/documents/rda_30")