Issue 18030: Location:  Pg. 613, Figure 17.6 - :  Incorrect multiplicities in the metamodel in Figure 17.6 (uml25-ftf)
Source: Lockheed Martin (Mr. Lenny Delligatti, lenny_delligatti2(at)omg.org)
Nature: Revision
Severity: Significant
Summary: The multiplicity shown for “coveredBy : InteractionFragment” is “*”.  However, I believe the lower multiplicity should be 1, not 0.  A lifeline can only exist within an Interaction; it cannot exist independently.  This is affirmed by the multiplicity of “1” shown in this figure for the end “interaction : Interaction”.  And an Interaction is a type of InteractionFragment as we see in the metamodel in Figure 17.1.  Therefore, an instance of Lifeline must always know at least one instance of InteractionFragment:  the Interaction that owns it.  And thus, the multiplicity for “coveredBy : InteractionFragment” should be “1..*”, not “*”.

Proposed Resolution:
Change the multiplicity for the end “coveredBy : InteractionFragment” to “1..*”

Resolution: 
Revised Text: 
Actions taken:
September 27, 2012: received issue
Discussion: 

End of Annotations:=====
s is issue # 18030

Problem: 17.012

Severity:  Significant
Nature:  Contradiction
Location:  Pg. 613, Figure 17.6
Title:  Incorrect multiplicities in the metamodel in Figure 17.6
Summary: 
 
The multiplicity shown for .coveredBy : InteractionFragment. is .*..  However, I believe the lower multiplicity should be 1, not 0.  A lifeline can only exist within an Interaction; it cannot exist independently.  This is affirmed by the multiplicity of .1. shown in this figure for the end .interaction : Interaction..  And an Interaction is a type of InteractionFragment as we see in the metamodel in Figure 17.1.  Therefore, an instance of Lifeline must always know at least one instance of InteractionFragment:  the Interaction that owns it.  And thus, the multiplicity for .coveredBy : InteractionFragment. should be .1..*., not .*..
 
Proposed Resolution:
Change the multiplicity for the end .coveredBy : InteractionFragment. to .1..*.
 
Source:         Lenny Delligatti