Appendix A Object Types Composite Object Types
3BDS011222-510 B 537
Formal Instance List Definition Aspect
The Formal Instance List Definition aspect makes it possible to change the wanted
instantiation structure of a formal instance list after it has been created.
Composite Object Types
Formal instances are used when composing composite object types. Composite
object types let the user create object types that when instantiated produces multiple
objects in a structured way. This is illustrated in Figure 333.
Figure 332. Formal Instance List Definition Aspect View
Composite object types have to be put into a library. Aspects extending these
object types have to be put into library extensions or these object types have to
belong to a system extension. (Information on libraries see Libraries on page 485
and Appendix B, Library Handling)
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