Extended the text in Section 4.3.1 to explain the different significance of the
RAO and NSLPID values in a Q-mode message. (4.3.4 itself is not changed.)
Revised text in 4.3.1:

   Several different RAO values may be used by the NSIS protocol suite.
   GIST itself does not allocate any RAO values (for either IPv4 or
   IPv6); an assignment is made for each NSLP using MRMs that use the
   RAO in the Q-mode encapsulation.  The assignment rationale is
   discussed in [15].  The RAO value assigned for an NSLPID may be
   different for IPv4 and IPv6.  Note the different significance between
   the RAO and the NSLPID values: the meaning of a message (which
   signalling application it refers to, whether it should be processed
   at a node) is determined only from the NSLPID; the role of the RAO
   value is simply to allow nodes to pre-filter which IP datagrams are
   analysed to see if they might be Q-mode GIST messages.

Email discussion:

> Section 4.3.4.  Please be consistent also about the use of RAO Value 
> vs. NSLPID.  (What is their relationship to one another, also needs to 
> be defined.) The first paragraph in this section uses NLSPID, while 
> point 1 immediately following uses RAO value and NSLPID.)

See the end of 4.3.1; this defines the relationship. The point here is that,
semantically, only the NSLPID is significant in deciding whether to process a
message; however, the RAO value can affect whether or not a message will be
intercepted in the first place.

From Lisa Dusseault:

Section 4.3.4.  Please be consistent also about the use of RAO Value vs. NSLPID.
 (What is their relationship to one another, also needs to be defined.) The
first paragraph in this section uses NLSPID, while point 1 immediately following
uses RAO value and NSLPID.)