IETF Internet Engineering Task Force, RFC 3986: Uniform Resource Identifier (URI)

This specification defines the generic URI syntax and a process for resolving URI references that might be in relative form, along with guidelines and security considerations for the use of URIs on the Internet.

IETF Internet Engineering Task Force, RFC 3986: Uniform Resource Identifier (URI): Generic Syntax, in T. Berners-Lee, F. R. and L. Masinter, eds., 2005, http://www.ietf.org/rfc/rfc3986.txt.

About URLs use for identification

About URL implications for identification, the document says that “although many URI schemes (e.g. URLs) are named after protocols, this does not imply that use of these URIs will result in access to the resource via the named protocol. URIs are often used simply for the sake of identification”

Maturity Estimate: 
Unspecified