# Section 6.5:
Type Graph

A Type graph is the structure which is used to determine type correctness for a complete compiled program. Either of the sets may, of course, be empty. It is expected that the checking of the type graph should only be done once, filling in as needed from the collection of individual class definitions.

Type_Graph ::
subtypes : set of Type_Specifier
supertypes : set of Type_Specifier ;

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