How to capture soap xml through tsahrk

tshark -w   data.pcap

#!/bin/bash 

TSHARK=tshark PCAP=./data.pcap 

# write the streams to individual files 

while read stream 

do 

echo "writing stream $stream --> $stream.txt"

 $TSHARK -qz follow,tcp,ascii,$stream -r $PCAP > $stream.txt 

done < <($TSHARK -T fields -e tcp.stream -r $PCAP | sort | uniq)