Building a subset XML

Hi,
I have data in XML structure is a CLOB colum in a table. Now I want to access data from that XML structure in the CLOB and bring out the desired data as an XML structure which will be a subset of the XML structure in the CLOB.
Is there a way of building and XML subset from a XML in the table in a PLSQL block.
E.G.
/********INPUT**********/
XML in the CLOB--
<?xml version = '1.0'?>
<ROWSET>
<ROW num="1">
<EMPNO>12</EMPNO>
<DEPTNAME>Finance</DEPTNAME>
<PERSON>
<NAME>Mark</NAME>
<CONTACT>
<PHONE>12-3456</PHONE>
</CONTACT>
</PERSON>
</ROW>
<ROW num="2">
<EMPNO>10</EMPNO>
<DEPTNAME>HRD</DEPTNAME>
<PERSON>
<NAME>Twain</NAME>
<CONTACT>
<PHONE>029-964</PHONE>
</CONTACT>
</PERSON>
</ROW>
</ROWSET>
/****************OUTPUT***********/
desired data as XML subset.
<PERSON>
<NAME>Twain</NAME>
<CONTACT>
<PHONE>029-964</PHONE>
</CONTACT>
</PERSON>
Regards,
Milton C.

If you want to transform an XML into another XML, based on certain rules that you can specify in advance, then XSLT is one way to do that. But you already seem to know that -- so why the question?

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