resource record
Click on the red underlined text to get to the source
... The Naming Authority Pointer (NAPTR) DNS Resource Record (RR)
specified here was originally produced by the URN ...
... URI) could be decomposed in such a way
that they could be changed and re-delegated over time. The result
was a Resource Record that included a regular expression that would
be used by a client ...
... expressions to loose their ability to be universally applicable.
All DNS resource records have a Time To Live (TTL) associated with
...