In {TAIL ~ other features}, {HEAD ~ the application} means selects the desired packet data network identifiers 
In
In { TAIL ~ other features } , { HEAD ~ the application } means selects the desired packet data network identifiers
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH