Issue 6457:  Abandon the OMGS4LMMA (uml2-superstructure-ftf)
Source:  (, )
Nature: Uncategorized Issue
Severity: 
Summary: If the so-called OMGS4LMMA is accepted, it is not possible that an InformationFlow could connect both Classes and Instance Specifications.
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Suggested resolution: Abandon the OMGS4LMMA.  Apply InstanceSpecification uniformly (for example, an informationFlow is used to connect classes and an instanceSpecification  of an informationFlow is used to connect instanceSpecifications of classes, that is, to connect objects.

Resolution: 
Revised Text: 
Actions taken:
November 7, 2003: received issue
March 9, 2005: closed issue
Discussion: 
The issue is not clear what document changes are required to ‘abandon the
OMGS4LMMA’: in general in the past restrictions claimed as a result of the 4 layer
metadata architecture were based on a misunderstanding rather than anything
documented in an adopted specification. There is nothing (e.g. in section 7.2 of
Superstructure, in particular 7.2.8) to stop linking of classes at different meta-levels:
indeed this is used in Profiles.
With respect to the example of InformationFlows these do not in fact cross meta- levels
since an instance of InstanceSpecification is at the same level (M1) as an instance of
Class: as section 7.2.9 of Superstructure states “The instances, which are sometimes
referred to as “run-time” instances, that are created at M0 from for example Person
should not be confused with instances of the metaclass InstanceSpecification that are also
defined as part of the UML metamodel“
Disposition: Closed, no change
End of Annotations:=====
f the so-called OMGS4LMMA is accepted, it is not possible that an InformationFlow could connect both Classes and Instance Specifications.
...


Suggested resolution: Abandon the OMGS4LMMA.  Apply InstanceSpecification uniformly (for example, an informationFlow is used to connect classes and an instanceSpecification  of an informationFlow is used to connect instanceSpecifications of classes, that is, to connect objects.