X.501 is part of the X.500 ITU provides a number of different models for the Directory as a framework for the other Recommendations in the ITU-T X.500-series.

The models are:

  • the overall (functional) model
  • the administrative authority model
  • generic Directory Information models
    • providing Directory User
    • Administrative User views on Directory information
    • generic Directory System Agent (DSA)
    • DSA information models and operational framework
    • a security model.

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