ISO 10303-214:2010(E)
A Derived_geometry is the identification of a Constructive_geometric_element that is derived from an existing aspect of the shape of a part for tolerancing purposes.
The data associated with a Derived_geometry are the following:
The geometry specifies the Constructive_geometric_element that is used for tolerancing.
See derived_geometry to constructive_geometric_element for the application assertion.
The is_derived_from specifies the set of Shape_element objects from which the geometric element is derived.
See derived_geometry to shape_element for the application assertion.
The role specifies the function of the Constructive_geometric_element when it is used as Derived_geometry.
EXAMPLE 'symmetry plane' is an example for the role.
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