CDA ci860 Specifications Page 524

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Aspects Appendix A Object Types
524 3BDS011222-510 B
The super type reference aspect has the same user interface as the type definition,
but all controls are read-only.
Object Type Extension Definition Aspect
The Object Type Definition aspect mentioned above is a central place where rules
regarding many different aspect systems can be specified. If these aspect systems
are delivered from different sources, it can be hard to combine all rules in one single
type definition aspect.
Aspects of the Object Type Extension Definition aspect category are therefore
useful, because they can incrementally add rules to the object type definition aspect.
Multiple type extensions are allowed.
Object Factory Aspect
The Object Factory aspect is used when you want to specify category rules and child
rules as in the Object Type Definition, but without actually defining an object type.
This can be used for untyped singleton objects, where it feels unnecessary to create
an object type for this single instance.
Typical examples are the root objects of many structures, such as the Service
Structure, the Node Administration Structure, and the User Structure.
Object Factory aspects can also be placed on aspect category objects for structure
aspects, to control which object types are allowed at the root of a structure.
See Child Control Tab on page 532.
Object Type Group Reference Aspect
All aspect objects in an object type group have an Object Type Group Reference
aspect, which is an aspect of the aspect category that the object type group defines.
If the object type group is called Motors, then this aspect will be called Motors
Reference. It is used as a parent link from each member of the object type group to
the object type group itself.
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