[Mip6] Comments on draft-chen-mip6-gprs-02.txt

I understand from the authors that this document is targeting for individual
RFC submission. I only have some editorial comments. 

minor nits:
In my copy, I was getting blank pages off and on. Please check if it still 
happens in the latest version.

General comment: Since this document describes issues with GPRS services
and IMS services, it might be better to organize the issues under each of
those services; for example:

3.1 GPRS Services
   3.1.1 Mobile Terminal defined packet filtering
   3.1.2 Network Service Defined packet filtering

3.2  IMS Services
    :
    :

 In section 3.1 "The TFT only applies...with it" is not very clear, please
 re-word the senstence.

 4.1.1.2  "As a result, two possible decisions can be made by the GGSN... to B"

 Is this indicating possible solutions or today GGSN is capable of handling the
 Route optimization this way?

 section 4.2.1.2

 "If tunnelled packets ....PDP Context to B" - may be this part of text is
 redundant since we are describing the issues.

 section 5. 
 At the end of the page, it made reference to [14] which is non-existent.

 As discussed before on the private list that "home agent tunneling" is due
 to the issue of GGSN's handling of IP-in-IP tunnel - it is not a MIP6 specific
 issue - it should be mentioned in  the document to clarify that.

 -Samita

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