SYSML2 — Parameter symbol notation needs improvement

The current graphical notation for parameters is similar to SysML v1, i.e. a (rounded) square attached to outside of the border of an action symbol. A directional parameter has a line arrow indicating in, out or inout direction. The notation is inconsistently depicted: both full squares outside the border and half squares outside the border (like in SysML v1) are used. See e.g., Representative Notation Table in section 7.16.1 page 194.

There should be a single standard notation that is clearly differentiated from port symbols. Also, the direction arrows should be clearly readable in large and busy diagrams with many parameters (nested and non-nested).

Alternative parameter symbol notation has been developed that uses a circular shape that straddles the border of the owning action (definition or usage), and has solid triangular arrow symbols.