Internet resources identification

• URI - Uniform Resource Identifier (RFC 2396)

  • URL - Uniform Resource Locator (RFC 1630)
    • identify objects accessed with existing protocols
    • PURL - Persistent URL
  • URN - Uniform Resource Name (RFC 1737)
    • globally unique, persistent identifiers
  • URL identifies the location of a resource identified by a URN

• URC - Uniform Resource Characteristics

  • data about the networked resource
  • metadata = data about data

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