To capture xml namespace you need to manually place custom sensor.
Get the method & class name from the developer and set custom sensor and enable it.
You will get the output in PurePath.
Setup custom sensor : Edit System Profile --> Sensors --> add new sensor group --> click on browse --> select agent group and refresh --> search for the method/class/ drop using package --> select it & ok --> edit the method --> enable capture --> apply & ok
Edit system profile --> place the agent group (if hot sensor placement is available in perform it or jvm refresh is needed) then check for the method in purepath you will see the xml namespace calls.