[Simple] Domain identifier in common policy

[Henning Schulzrinne <hgs at cs.columbia.edu>]

The last remaining open issue in common policy is the format of the 
domain attribute in common policy.

Concrete suggestion:

Use RFC 3987 (internationalized domain names):

ihost = IP-literal / IPv4address / ireg-name

Every URI is also an IRI, so this should work generally. This supports 
both IPv4 and IPv6. RFC 3987 also provides comparison rules, in Section 
5. This has the advantage that the same code would already be needed for 
the full IRI comparison for the 'id' parameter.

Henning

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