Community
Participate
Working Groups
The palette item for the subject assumes that the subject is a kind of Component, which is a very specialized type of classifier (in fact, in my view, Components are not particularly useful in UML, since structured classes pretty much cover everything components can represent and more.) If a default subject has to be included it should be a class, not a component (remember, a structured class can also contain an internal structure, ports, connectors, etc.). However, it should be possible to select from a number of different classifier types (actors, classes, components, etc.) When I tried to create a custom palette for use cases, for some reason I could not include Class, since it was not available for inclusion in the palette. Strange.
(In reply to comment #0) > The palette item for the subject assumes that the subject is a kind of > Component, which is a very specialized type of classifier (in fact, in my view, > Components are not particularly useful in UML, since structured classes pretty > much cover everything components can represent and more.) If a default subject > has to be included it should be a class, not a component (remember, a structured > class can also contain an internal structure, ports, connectors, etc.). However, > it should be possible to select from a number of different classifier types > (actors, classes, components, etc.) When I tried to create a custom palette for > use cases, for some reason I could not include Class, since it was not available > for inclusion in the palette. Strange. Right, the tool should not make such choices. Also there is a confusion between "subject" and "containment" relationship here. In the UseCase diagram, it should be possible to show a UseCase in any of its subject. Currently the UseCase can only be dropped in its container (which may be the subject or not).
this bug is linked to this one: https://bugs.eclipse.org/bugs/show_bug.cgi?id=281977
for the moment class component and Interface can be subject of the Usecase diagram
subject can be also StateMAchine and Datatype. see revision 7881
