Sap pi udf to accept the external namespace

Hi All,

we have a scenario of JMS to IDOC. In which the source xml is of format

Actual xml

<?xml version="1.0" encoding="UTF-8" standalone="true"?>

-<XTB xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="Namespace in PI">

<element>

</element>

</XTB>

The above xml is to be changed to the below format

Expected xml

<?xml version="1.0" encoding="UTF-8"?>

<ns0:MT_XTB xmlns:ns0="Namespace in PI">

<element>

</element>

</ns0:MT_XTB>

Please help me in handling the above scenario.Do we need any udf ?If udf is to be used please provide the udf.I am new to SAP PI.