Editing NAPTR record (section)

== Rationale ==
Uniform Resource Names ([[Uniform Resource Name|URNs]]) are a subset of Uniform Resource Identifiers ([[URI]]s) used for abstract identifiers, such as a person's name or their telephone number.  For URNs to be meaningful, they must be mapped to a concrete resource of some sort.  Uniform Resource Locators ([[URL]]s) are often used to describe such resources, such as a computer [[hostname]], or a local file.

The NAPTR record aids in the standardization of URNs.  NAPTR records map between sets of URNs, URLs and plain [[domain names]] and suggest to clients the protocols available for communication with the mapped resource.{{Ref RFC|2276}} Each NAPTR record contains a service name, a set of flags, a [[regular expression]] rule, an order value, a preference and a replacement pattern.  Multiple records can be chained together in a cascade to rewrite URIs in [[deterministic system (mathematics)|deterministic]] ways. These cascading rules have been standardized in {{IETF RFC|2915|3403|leadout=and}}.