ISO 10303-214:2010(E)
A Single_datum is a single element used as reference for tolerancing purposes.
A Single_datum is a type of Datum.
The data associated with a Single_datum are the following:
The datum_name specifies the word or group of words by which the Single_datum is referred to.
EXAMPLE Typical names of Single_datum objects are 'A', 'B', or 'C'.
The modification specifies a Tolerance_condition that is associated with the application of the Single_datum.
EXAMPLE Material conditions such as LMC or MMC are typical conditions.
See single_datum to tolerance_condition for the application assertion.
The modification need not be specified for a particular Single_datum.
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