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SysML permits any property shown on an internal block diagram to also show compartments within the property box. These compartments may be given standard or user-customized labels just as on block definitions.

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Source
OMG Systems Modeling Language (SysML) 1.6
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
NOTATION
UML keywords
compartment
SysML keywords
property compartment
SysML Internal Block Diagram
IBD :features compartments
:values compartment
:parts compartment
:properties compartment
:references compartment
:flow properties compartment
:operations compartment
Full quote
SysML permits any property shown on an internal block diagram to also show compartments within the property box. These compartments may be given standard or user-customized labels just as on block definitions.
Next snippet
All features shown within these compartments shall match those of the block or value type that types the property.
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All features shown within these compartments shall match those of the block or value type that types the property.
The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label. The compartment name is otherwise the same as it would appear on ...
The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label.
The compartment name is otherwise the same as it would appear on the type on a block definition diagram.
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