Figure 08: Model: Bunker shield assembly for the the Platypus reflectometer as UML2 composite structure diagram with flowport notation.

The «block» class is wrapped by a block «wrapper» Component that is hyperlinked to a block wrapper class diagram for the block. Other «block» classes are shown to provide a usage context and alternative navigation points1. Physical values (part-specific defaults) are not easily shown on the parts2. The limits of the port-based modelling and assembly interpretations are challenged by a postbunker guide that is part inside and part outside the bunker.

1. 1. Since 2008 MagicDraw UML supports easier navigation to clients of a Class in a Composite Structure Diagram, so there is less need for this strategy now. Note also that it is not always wise to indicate the usage context explicitly, it can prevent modularisation !
2. 2. Since 2008 MagicDraw UML supports SysML-style property-specific value indicators on UML Property symbols in composite structure diagrams