Explanation
The main diagram type in Modelica corresponds most closely to the ibd (internal block diagram) in SysML.
An ibd shows the internal structure of a block in terms of its parts, ports, connectors, and flows. It is similar to a Modelica diagram, which shows the components of a model in terms of their connectors and equations. Both diagram types can be used to represent physical systems composed of interconnected elements with defined behaviors and properties. References:
https://www.omg.org/ocsmp/ocsmp-adv-exam.htmhttps://modelica.org/documents/ModelicaSpec34.pdf