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Reusable constraint definitions may be specified on block definition diagrams and packaged into general-purpose or domain-specific model libraries. Such constraints can be arbitrarily complex mathematical or logical expressions.

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Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Constraint
SysML keywords
ConstraintBlock
MD:ConstraintParameter
constraint parameter
SysML Block Definition Diagram
Keywords
Constraint blocks define generic forms of constraints that can be used in multiple contexts. For example, a definition for Newton’s Laws may be used to specify these constraints in many different contexts.
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Reusable constraint definitions may be specified on block definition diagrams and packaged into general-purpose or domain-specific model libraries. Such constraints can be arbitrarily complex mathematical or logical expressions.
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The constraints can be nested to enable a constraint to be defined in terms of more basic constraints such as primitive mathematical operators.
Parametric diagrams include usages of constraint blocks to constrain the properties of another block.
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Constraint blocks provide a mechanism for integrating engineering analysis such as performance and reliability models with other SysML models.
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A constraint block is defined by a keyword of «constraint» applied to a block definition. Properties of this block define parameters of the constraint, with the exception of properties that hold internally nested usages of constraint blocks.
A parametric diagram is a restricted form of internal block diagram that shows only the use of constraint blocks along with the properties they constrain within a context.
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