CDA ci860 Specifications Page 539

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Appendix A Object Types Composite Object Types
3BDS011222-510 B 539
Every formal instance object has a Formal Instance Definition aspect, and actual
instances of the formal instance have a corresponding Formal Instance Reference
aspect.
Terminology
A composite object type describes a set of objects organized in structures, with a
parent object and one or several child objects. The children in a composite object
type are called formal instances, because they instantiate object types defined
elsewhere in the Object Type Structure but they are not actual instances. When a
composite object type is instantiated, actual instances are created for these child
objects.
A composite object type includes a description of how its child objects shall be
inserted into different structures when the composite object type is instantiated.
The instantiation is described separately for each structure using a formal instance
list. Below the formal instance list the desired object hierarchy for a certain
structure is specified.
When you instantiate a composite object type you get a composite object instance.
The composite instance is one single unit, although it can include several child
objects that are spread out in different structures.
The child objects that belong to the composite instance are called embedded
instances. Instances that are not controlled by a surrounding composite instance are
called independent instances.
Figure 334. Composite Object Type
Formal Instance List
Formal Instance
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