RFC 3958:Domain-Based Application Service Location...
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IANA-registered tag

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2. Straightforward-NAPTR (S-NAPTR) Specification
... independent of the protocol that may be used to offer it. Each application service will be associated with an IANA-registered tag. For example, retrieving mail is a type of application service that ...
... application protocol" is used to implement the application service. These are also associated with IANA-registered tags. Using the mail example above, "POP3" and "IMAP4 ...

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