This page identifies a possible issue, inconsistency, concern, error, or bug!
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A Modelica.Blocks.Logical.Switch has a control port u2 of type BooleanInput.
The MagicDraw SysML Plugin and Magic Cyber-Systems Engineer ® (Cameo Systems Modeler®) library for SysPhS has u2 : RealSignalInElement [1] (which the spec table on p.60 implies).
In Wolfram SystemModeler it is not even permitted to connect from a RealOutput to a BooleanInput port.