Explain the association relationships with the Block in the diagram, see image

[Chris]

Please check the attached figure. I have block A, inside this block I added the block B and constraint property C, in addition outside the block I have constraint property D. I insert all of them in a BDD to see their relationships with A. It can be seen that B appears with a containment relationship, however C does not but it does appear as part. I added a composite relationship with D and appears as part but in this case with a different symbol.

Why C does not appear with a containment relationship if I added it inside A. And why the difference of symbol of the parts of A? Can you give me the meaning as is presented in the diagram? For instance: block B is contained by A, etc.

[Tim Weilkiens]

Hi,

 

The relationship between A and B is a namespace containment relationship. The relationship between A and D is a composition respectively association relationship. Between A and C can be a composition relationship, too. Maybee it is just not depicted in the diagram. However, C can also be just a part property without the composition relationship.

 

BTW C and D should be constraint blocks instead of constraint properties.

 

Best regards,

Tim

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[Remy Fannader]

Why introduce complexity when it could be simple ?

If a strong composition connector (black losange) means bound identity, nothing more has to be said

The concept of containment is ambiguous; using container is more precise as it leave room for options to be specified by connectors. 

https://caminao.blog/community/building-bridge/

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[James Towers]

Containment is a relationship between model elements that defines how the model is organised (by Namespace). It doesn't represent a relationship in the system-of-interest being modelled. 

Hence blocks, which represent structural elements in the system-of-interest, may be contained in Packages, which are model constructs used for organising the models structure and controlling access to it. 

Composition on the other hand, is a representation of a relationship between the structural elements in the system-of-interest. 

They have different semantics

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[geoff]

Read this by Rick Steiner: https://sdincose.org/wp-content/uploads/2013/11/11-Rick-Steiner-SysML-Conceptual-Stumbling-Blocks.r.04.pdf

and this blog post by Rick: http://blog.ricksteiner.net/?p=69

The works by Rick should answer your question.

[Remy Fannader]

That's the point: overlapping of different semantics, in that case container (a functional property of an objects), and containment (a semantic one for packages). 

https://caminao.blog/2015/09/17/sysml-blocks/

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[Chris]

Thank you all, the concepts are clear now. In summary, a namespace containment refers to the organization of the model and composition containment relates to a structure.