ISO 10303-214:2010(E)
A Parallelism_tolerance is a constraint that specifies that a surface or a curve shall be parallel to a reference datum, with an allowed amount of deviation. This reference datum is either a datum plane or a datum axis.
A Parallelism_tolerance specifies one of the following:
A Parallelism_tolerance is a type of Geometric_tolerance.
The data associated with a Parallelism_tolerance are the following:
The affected_plane specifies the plane in which the tolerance applies.
This attribute covers information that is given on drawings implicitly by the drawing plane. If the affected_plane is not specified, the tolerance applies in all directions (on drawings indicated by the diameter symbol) .
See parallelism_tolerance to reference_plane for the application assertion.
The affected_plane need not be specified for a particular Parallelism_tolerance.
The reference_datum specifies the Datum_reference objects that define the reference for this type of geometric tolerance.
See parallelism_tolerance to datum_reference for the application assertion.
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