[dccp] SHOULD vs. MUST in the Port Numbers section

[Eddie Kohler <kohler at cs.ucla.edu>]

Hi all,

There are a number of SHOULD/SHOULD NOTs in the Port Numbers section  
that could be MUST/MUST NOTs; specifically, these four:

    o  A short English phrase describing the port's purpose.  This
       SHOULD include one or more space-separated textual Service Code
       descriptors naming the port's corresponding Service Codes...

    o  A port name SHOULD NOT be registered for more than one DCCP port
       number.

    o  Any such registration [of a port name registered for UDP]
       SHOULD use the same port number as the existing UDP  
registration.

    o  However, if such a registration [of a TCP/SCTP port name] makes
       sense ... the DCCP
       registration SHOULD use the same port number as the existing
       registration.

I left them as SHOULDs because I did not want to imply that IANA  
should check them, and because in some cases UDP and TCP themselves  
do not follow these rules.

Anyone have any feelings about changing these four SHOULD/SHOULD NOTs  
to MUST/MUST NOTs?  I'd default to leaving them as SHOULD/SHOULD NOTs.
Eddie