Registry&Directory InfrastructureNames and Identifiers

• Names & identifiers are subtlely different beasts

• Identifiers are unique

  • A given identifier maps to one subject
  • Subjects have multiple forms of identifiers
  • E.g. “account form” -- 8 chars, alphanumeric
  • “Long form” -- First.Last
  • Some system-specific forms, e.g. Unix UID, DCE UUID, MS GUID, etc.

• Natural names are both..

  • Non-unique
  • and mutable -- they can & do change

• Use the directory to map all the above to a subject

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