ISO 10303-214:2010(E)
A Datum_reference is the usage of a Datum by a geometric tolerance.
The data associated with a Datum are the following:
The precedence specifies the priority assigned to this instance of Datum_reference when it is referenced by a geometric tolerance.
The referenced_datum specifies the instance of Datum that is referenced by the Datum_reference.
See Datum_reference to Datum for the application assertion.
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