Source: NASA ( Nicolas Rouquette)
Table 9.4.1 states:
When the value of a Property is null, it is serialized as XMIValueElement with attribute nil=’true’.
In UML, null means "lack of a value".
MOF (which is based on a subset of UML) inherits this – that is, for MOF, null also means "lack of a value".
Currently, many UML tools do not serialize null-valued properties according to the rule above, instead, the property is not serialized at all.
Reported: XMI 2.5 — Wed, 22 Jun 2016 21:45 GMT
Updated: Thu, 23 Jun 2016 04:59 GMT