ddedim - Collection size

The collection size defines the fixed number of elements in an attribute array or the maximum number of instances in a collection (extent, reference or relationship).

For an attribute array, the dimension defines the exact number of instances allocated for the attribute array. The dimension for attributes must be at least 1.

For reference collections the dimension defines the maximum number of instances that can be referenced within the collection. 0 or undefined indicates that there is no limit for the collection. A dimension value 1 for a collection defines a "single reference".

Base structure properties do always have a collection size 1.