(newby) extraction of CDATA nodes to different XML fil

Hi,

I need to extract the contents of three particular nodes in an XML
file to three separate XMLs.
The elements have the strange definition shown below:
<![CDATA[   .....snip.....   ]]>

Whenever I encounter that type of construct I would like to extract
the data that it contains to a separate XML.

Can you give some hints to solve this task?

Thank you very much.
Best regards.

Livio