Legacy Issue Number: 10447
Source: Change Vision ( Michael Chonoles)
The SysML spec says that a BDD can be used for functional decomposition because an Activity is a Class in UML. (see the end of 11.1; 220.127.116.11)
However, the spec says elsewhere that a BDD can only be for Blocks, Packages, or constraint blocks.
For example, Annex A.1 (p 167)
The following are the designated model elements
associated with the different diagram kinds.
activity diagram - activity
block definition diagram - block, package, or constraint block
internal block diagram - block or constraint block
From 8.3.2, it is clear that while a block is a class, a class is not a block.
From this, it is unclear how a block diagram can really (formally) be for an activity.
1) Let a bdd for any classifier
This has the extra advantage of allowing bdd’s for actors, ports, etc.
2) Change the annex to allow a bdd to be for activities (and perhaps actors, ports )
3) Change the definition of a SysML activity to be both a UML4SysML Activity and a SysML Block (probably too complicated)
Also the example diagrams (such as figure 11.1 and the figure in Table 11.3 row 1) should have a complete diagram header. This should at least include the model element type for the diagram (to be consistent with the solution above).
They should also have a «diagramUsage» if one is required (as implied by Table 11.3)
Reported: SysML 1.0b1 — Thu, 9 Nov 2006 05:00 GMT
Disposition: Resolved — SysML 1.0
No Data Available
Updated: Fri, 6 Mar 2015 20:58 GMT