Urgent: How to Retrieve NameSpace in Oracle 10.2.0.2.0

Hi,
I am facing one strange issue. With Oracle 10.2 version every xml tag value can be retrieved with only NameSpace value. The interesting thing is even for Retrieving the NameSpace value also it is expecting the NameSpace. So with this issue i am unable to parse any of the xml files to retrieve other tag information. I can't hardcode the NameSpace value in my StoredProcedure since the NameSpace value will be changing.
Do i have any other method to retrieve the NameSpace value which is supported by Oracle 10.2.0.2.0 version. Please suggest me urgently. With Oracle 9.2.0.7.0 version i am able to retrieve the NameSpace or any tag information without using Extract method without the NameSpace value.
The xml file is of this format:
<?xml version="1.0" ?>
<x:recording xmlns:x="http://www.witness.com/xmlns/recording20040324" x:ref="600000000000046" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.witness.com/xmlns/recording20040324 RecordSegment.xsd">
</x:recording>
The syntax for retrieving the NameSpace value:
select x.xml_data.extract('//@xmlns:x').getStringVal() from xmlprocess x;
Where "xmlprocess" is a GlobalTemporary table with xmltype datatype.
Eventhough the syntax is not throwing any errors, it is returning the NameSpace value as NULL for Oracle 10.2
Please provide the solution.
Thanks

Guys any idea on this? I am in very much in need of this solution. Please suggest me .
Thanks
Rao

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