From http://www.dns-sd.org/ServiceTypes.html
The primary historical list of DNS SRV (RFC 2782 <http://www.ietf.org/rfc/rfc2782.txt>) service type names for existing protocols with well-known port numbers is given in the IANA list of assigned port names and numbers <http://www.iana.org/assignments/port-numbers>. *However, that list does not include any information about the defined DNS-SD TXT keys, and that list includes only protocols that have fixed well-known port numbers, which is unfortunate, because one of the big benefits of DNS SRV is that it obviates the need for fixed port numbers in most cases.
*Sounds perfect for traversing firewalls doesn't it? We need to perform modifications as suggested by Sim to divorce Jini from TCP.
