ISO 10303-214:2010(E)
A Common_datum is a set of two Single_datum objects of equal importance which are used to establish a single datum plane or axis.
EXAMPLE Figure 19 shows the usage of Common datum objects for tolerancing.
A Common_datum is a type of Datum.
The data associated with a Common_datum are the following:
is_made_up_by
The is_made_up_by specifies the set of Single_datum objects that form the Common_datum.
See common_datum to single_datum for the application assertion.
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