How are Clump resources referenced?

• URL: Universal Resource Location

  • protocol://host:port/directory-path/filename
  • http://lcweb.loc.gov/z3950/agency/

• URN: Universal Resource Name

  • urn:namespace:name
  • urn:isbn:123456789x

• PURL: Persistent Universal Resource Location

  • protocol://resolver-address/name
  • http://purl.oclc.org/home/fred/catalog

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