MagicDraw/Cameo: Does not show the “structure” label at the top of an internal structure compartment.
A compartment with the label “structure” may appear as part of a block definition to show connectors and other internal structure elements for the block being defined. This compartment may contain any of the graphical elements of an internal block diagram Source OMG Systems Modeling Language (SysML) 1.6
The Internal Block Diagram in SysML captures the internal structure of a block in terms of properties and connectors between properties. Source OMG Systems Modeling Language (SysML) 1.6