tag
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... 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
...
... POP3, IMAP4). A tag, such as "RetMail", could be registered for it.
(Note that this has not been done, and there are no plans to do so at
the time of this writing.)
...
... 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 ...
... IMAP4" could be registered as
application protocol tags. If multiple transports are available for
the application, separate tags ...
... tags. If multiple transports are available for
the application, separate tags should be defined for each transport.
...
... The intention is that the combination of application service and
protocol tags should be specific enough that finding a known pair
(e.g., "RetMail:POP3" would be sufficient for a client ...
... NAPTR resource
records for example.com, shown in the figure below, where "WP" is the
imagined application service tag for "white pages" and "EM" is the
application service tag ...
... application service tag for "white pages" and "EM" is the
application service tag for an imagined "Extensible Messaging"
application service.
...
... S-NAPTR DDDS
application, this means a SERVICE field that includes the tags for
the desired application service and a supported application protocol ...
... ; The app-service and app-protocol tags are limited to 32
; characters and must start with an alphabetic character.
...
... IANA-registered service; see Section 7
for instructions on registering new application service tags.
...
... standard, registered protocols; see section 7 for instructions on
registering new application protocol tags.
...
...
This document calls for two IANA registries: one for application
service tags, and one for application protocol tags.
...
... Application Service Tag IANA Registry ...
... registry for S-NAPTR
Application Service Tags, listing at least the following information
for each such tag:
...
... Application Service Tags, listing at least the following information
for each such tag:
o Application Service Tag ...
... service defined in section 6.5.
o Defining publication: The RFC used to define the Application
Service Tag, as defined in the registration process, below.
...
... registration process, below.
An initial Application Service Tag registration is contained in [9].
...
... S-NAPTR
Application Protocol Tags, listing at least the following information
for each such tag:
...
... Application Protocol Tags, listing at least the following information
for each such tag:
o Application Protocol ...
...
o Application Protocol Tag: A string conforming with the iana-
registered-protocol defined in section 6.5.
...
...
o Defining publication: The RFC used to define the Application
Protocol Tag, as defined in the registration process, below.
...
...
All other application service and protocol tags are registered based
on the "specification required" option defined in [7], with the
...
... category).
No further restrictions are placed on the tags except that they must
conform with the syntax defined below (Section 6.5).
...
... conform with the syntax defined below (Section 6.5).
The defining RFC must clearly identify and describe, for each tag
being registered,
...
...
o application protocol or service tag,
o intended usage,
...