Hierarchy: Is-Composed-Of

• Definition: a is-composed-of b if b is a component of a and encapsulated within it

• System structure can be specified by the is-composed-of relation where

  • non-terminals are virtual code
  • terminals are the only units represented by code

• In such a case the uses relation is specified over the set of terminals only

• The is-composed-of relation should be acyclic

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