ISO 10303-214:2010(E)
A Datum_defined_by_targets is a datum that is represented by a set of Datum_target.
A Datum_defined_by_targets is a type of Single_datum.The data associated with a Datum_defined_by_targets are the following:
The defined_by specifies the set of Datum_target that represents the Datum_defined_by_targets.
The rule_description specifies the type of Datum that is formed by the Datum_defined_by_targets.
EXAMPLE The rule_description 'V-block' indicates that two Datum_target objects on a cylindrical element are supposed to form the areas of contact in a V-shaped fixture.
The rule_description 'V-block' indicates that two Datum_target objects on a cylindrical element are supposed to form the areas of contact in a V-shaped fixture.See Datum_defined_by_targets to Multi_language_string for the application assertion.
The rule_description need not be specified for a particular Datum_defined_by_targets.
If present, there shall be exactly one object that defines the rule_description for a Datum_defined_by_targets.
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