XML parse error

I have been trying to handle XML CDR by using HTTP POST from freeswitch and dump the XML CDR in a file called dump.txt, using a file post.php which gets invoked as the call is hung up by the user... The XML CDR that i get in dump.txt says the following error "XML Parsing Error: not well-formed Location: http://www.w3schools.com/xml/xml_validator.asp Line Number 138, Column 25:     <sip_full_from><sip:1001@10.0.0.8>;tag=dfa2af08</sip_full_from> ------------------------^"