Supertype-subtypes: Example

Entity definition in EXPRESS

ENTITY named_unit

SUPERTYPE OF (ONE OF (length_unit, mass_unit, time_unit)

ANDOR (ONEOF (si_unit, conversion_based_unit)));

dimensions : dimensional_exponents;

END_ENTITY;

ENTITY si_unit ;

SUBTYPE OF (named_unit);

prefix : OPTIONAL si_prefix;

name : si_unit_name;

DERIVE

SELF\named_unit.dimensions : dimensional_exponents := dimensions_for_si_unit (SELF.name);

END_ENTITY;

ENTITY length_unit ;
SUBTYPE OF (named_unit);
END_ENTITY;

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