ISO 10303-214:2010(E)
A Change is a mechanism to collect the Model_change objects and the Property_change objects that describe the differences between the two objects referenced by the specified relationship object.
The data associated with a Change are the following:
The described_change specifies the relationship object that references a modified object and the corresponding original object.
See change to activity_relationship, change to complex_product_relationship, change to design_constraint_relationship, change to item_version_relationship, change to process_operation_occurrence_relationship, change to process_plan_relationship, change to replaced_definition_relationship, change to replaced_usage_relationship, and change to shape_element_relationship for the application assertions.
There shall be exactly one object that defines the described_change for a Change.
The description specifies additional information about the Change.
See change to multi_language_string for the application assertion.
The description need not be specified for a particular Change.
If present, there shall be exactly one object that defines the description for a Change.
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