Special Types of Object Modules

• Class (typical)

  • an implicit intent and (possibly) an explicit extent
  • uniformly available two-way interactions

• Type

  • intent (extent implicit and same as intent)
  • uniformly available two-way interactions (operations)

• Variable

  • extent with at most one value
  • query, add, remove, and modify
  • usually declared as a specialization of a type

• Value

  • extent with one value
  • query

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