ST6RI-807 Flow Connection Revision (SYSML2_-173)

[seidewitz]

This PR implements the resolution for the following issue approved on SysML v2 FTF 2 Ballot 5:

• SYSML2_-173 Flow connections are incorrectly both structure and behavior

This resolution updates the SysML v2 abstract syntax so that FlowConnectionDefinitions are no longer kinds of ConnectionDefinitions and FlowConnectionUsages are no longer kinds of ConnectionUsages. In particular, this means that FlowConnectionUsages are no longer PartUsages, so they no longer are included in the ownedParts of a Definition or the nestedParts of a Usage (they are still included in ownedConnections and nestedConnections). The resolution also moves the base types for FlowConnectionDefinitions and FlowConnectionUsages out of the Systems Library model Connections into a new model FlowConnections. The textual and graphical notation for flows is unaffected.

[seidewitz]

@himi
Please confirm that this update does not affect the visualization of flows.

@ujhelyiz
Note that the semantics tests have been updated to account for the abstract syntax and model library changes.

[ujhelyiz]

In general, the changes look good to me. However, I have found a minor issue with a comment and have a question about the changes in the SysML grammar. However, I consider neither of these as blocking issues.

[himi]

I found 17b-Sequence-Modeling did not seem to be visualized in 'Sequence' view. I will look into it. (Note that 17a-Sequence-Modeling worked properly)

I confirmed master trunk did not have this issue.

Sorry, it seemed that I did not refresh the library and clean the index properly

[himi]

After fully cleaned and rebuilt the model libraries, I confirmed the visualizer worked correctly.