This page identifies a possible issue, inconsistency, concern, error, or bug!
One of the ways Webel IT Australia helps promote tools, technologies, and languages is by donating a lot of time identifying, tracking, and reporting potential issues, in order to help vendors and developers improve the tools and technologies. In some cases, we also offer workarounds and advice for users. All issues tracked on our public site are offered most constructively and with sincerest gratitude to the tool vendors and technology developers.
DISCLAIMER: Vendors do not officially endorse issue analysis by Webel IT Australia.
The SysML-1.6 figures and tables (but not the XML only have Extension relationships from Rate to Parameter, and from Rate to ActivityEdge, and a Generalization relationships from Continuous to Rate and from Discrete to Rate.
But the tool additionally permits Continuous and Discrete to be applicable to ObjectNode, so one can apply them directly to Pin and ActivityParameterNode, which may in fact be desirable in the case of Pins, because otherwise you can't (it seems) show the «continuous» keyword if only applied to the Parameter of an InputPin or OutputPin. (If «continuous» is applied to the Parameter of an ActivityParameterNode it "shines through" like a so-called secondary stereotype.)
Visit also the OMG JIRA issue tracker links under External Links (members only)