ISO 10303-214:2010(E)
A Specified_instance is a mechanism to identify a certain Item_instance in a multi level assembly structure that reuses partial decompositions.
EXAMPLE A 'chassis' consists among others of the sub assemblies 'front axle' and 'rear axle'. Both axle assemblies consist, among others, of the 'left wheel' and the 'right wheel'. In order to identify the 'left wheel' of the 'rear axle', the Specified_instance object references 'left wheel' as related_instance, 'rear axle' as 'upper_usage', and 'chassis' as 'assembly_context'.
The 'definition' of a Specified_instance shall be the same object as the one referenced by the 'related_instance' as 'definition'.A Specified_instance is a type of Item_instance.
The data associated with a Specified_instance are the following:
The assembly_context specifies an Assembly_definition object in which the instance identified by this mechanism is used.
See specified_instance to assembly_definition for the application assertion.
The related_instance specifies the Item_instance that is to be identified.
The related_instance shall not be of type Specified_instance.
See specified_instance to item_instance for the application assertion.
The upper_usage specifies the Item_instance in which the related_instance is used. This Item_instance shall be the immediate upper level instance or another Specified_instance.
See specified_instance to item_instance for the application assertion.
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