SYSMLR — Issue on Block constraint#4

In SysML v1.3, §8.3.2.2 Blocks, the constraint #4 states:

“[4]In the UML metamodel on which SysML is built, a Property that is typed by a block must be defined as an end of an association. (An inverse end of this association, whether owned by another block or the association itself, must always be present so there is always a metamodel element to record the inverse multiplicity of the reference.)”

No such constraint exists in the UML specification which conversely says the following (UML v2.4, §7.3.45):

“A property related to a classifier by ownedAttribute represents an attribute, and it may also represent an association end. It relates an instance of the class to a value or collection of values of the type of the attribute”

The SysML Block constraint #4 has no clear justification and should be removed.

Defer

Postponed to the next RTF