UML22 — Section: 18.3.2

The definition of the attribute indicated that multiplicity may be [0..1], yet this is not supported by fig. 446 no by the association ownedEnd:ExtensionEnd[1]. Further, fig 446 does not indicate that the association ownedEnd:ExtensionEnd[1] redefines Association::ownedEnd. Additional Operations [3] says that a lower bound of 1 makes isRequired true, but the statement discussing attributes implies that the lower bound = upper bound. Shouldn't the Additional Operation [3] also indicate this? Notation in fig. 448 does not agree with the text description of the proper notation unless the notation for a MOF model is different than for UML in which case the text should explain that fig. 448 is not a UML notated diagram.

see above