ISO 10303-214:2010(E)
A Selected_instance is the identification of the occurrence of an object that is either defined as a Design_discipline_item_definition or as a Product_identification and whose quantity depends on certain constraints.
EXAMPLE In a BOM where the exact amount of grease or glue can usually not be specified as a quantity, the specification of this grease or glue are examples for Selected_instance objects.
EXAMPLE To minimize the concentricity error of a wheel, weights are attached to the rim; this set of weights is a Selected_instance. The quantity as well as the position of these weights depends on the concentricity behaviour of each particular wheel as manufactured and tested.
A Selected_instance is a type of Item_instance.
The data associated with a Selected_instance are the following:
The selected_quantity specifies the quantity of the part, tool or raw material foreseen as Selected_instance. The selected_quantity shall be of type Value_limit or Value_range.
NOTE If the quantity is to be specified as a minimum and/or a maximum, then Value_limit or Value_range may be used.
EXAMPLE The quantity of engine oil used in a car may be in the range of 3.7 to 3.9 liters. This is expressed using Value_range as the selected_quantity.
See selected_instance to value_with_unit for the application assertion.
The selection_control specifies the constraint that has to be evaluated for the Selected_instance.
EXAMPLE 'as required for balance' and 'as required for lubrication' are examples for a selection_control.
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