Mapping SELECT types: Example (2)

Entity definition in EXPRESS
ENTITY measure_with_unit;
value_component : measure_value;
unit_component : unit;
END_ENTITY;
TYPE measure_value = SELECT (length_measure, mass_measure);
END_TYPE;
TYPE unit = SELECT (derived_unit, named_unit);
END_TYPE;
Sample entity instance in data section
#202 = LENGTH_MEASURE_WITH_UNIT (LENGTH_MEASURE(498.0), #1021);
#1021 = LENGTH_UNIT( );

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