Tracking session in soap header?

when HTTP_REQUEST {
   collect the payload containing the POST data
  HTTP::collect [HTTP::header Content-Length]
}
when HTTP_REQUEST_DATA {
   persist on data from 59th character following 'xmlns:soapenc=' up to "<"
   and follow existing persistence record or create a new one
  persist uie [findstr [HTTP::payload] "xmlns:soapenc=" 58 "<"
}