ISO 10303-214:2010(E)
A Single_instance is one particular occurrence of an object that is defined either as a Design_discipline_item_definition or as a Product_identification.
NOTE A Single_instance may or may not be associated with placement information using an Instance_placement.
EXAMPLE In a Technical_solution for the 'front left brake', a 'brake disk' is used and its position is specified by a geometric Transformation.
A Single_instance is a type of Item_instance.
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