URIs

• Globally scalable unique identifiers.
• Most URI schemes leverage off DNS.
• May be used to encode function parameters.
  • http://www.w3.org/Systems/db/user?user=6350
• Persistence (continuity of retrievability and meaning):
  • No protocol guarantee of persistence.
  • Persistence is not a technical issue.
  • Persistence comes from social and organizational commitment.
  • Some sites like W3C offer social guarantee of site-wide persistence.