This article was written when SysML v1.3 specification is in releasing process. If you are a big fan of SysML and keep in touch with SysML RTF, you may have seen some documents or books about SysML v1.3 such as [1] and [2]. One of many things that I am impressed in those books and documents, is the way they use SysML to describe nested ports and specify compatibility between connected ports using association blocks. When two ports connected by a connector, they may have nested ports which themselves can be connected. An association block has been suggested for defining the internal structure of the connector. It could contain a set of connectors that define the connectors between nested ports of association ends. When a connector is typed by an association block, the interaction between roles at both ends of connector will be handled by the internal structure of the association block [1]. This approach give us not only the ability to decompose ports and connectors but also the a
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