Connecting the Representation with What It Represents

• A <Property Value> attached to some object X indicates the value of a property of the hierarchy of objects rooted at X - it describes an attribute of X.

• The meaning of a <Property Value> is specified with an SE_Property_Type - a "tagged union" data structure that may represent one of two kinds of codes:

  • EDCS_Attribute_Code (the most commonly used).
  • SE_Variable_Code, which is used primarily by the <Control Link> mechanism for specifying dynamic control, covered later.

Previous slide

Next slide

Back to first slide

View graphic version