This PR implements a proactive update to resolve the following issue, which is to be considered by the future KerML 1.1 RTF.

• KERML_-230 isCompatibleWith operation needs a return type

The PR updates the operations Type::isCompatibleWith and Feature::isCompatibleWith to add the missing return type of Boolean. The following files in the org.omg.sysml/model directory have been updated for this:

• SysML.uml
• KerML_only.uml

Note that the following files have not been updated:

• SysML_xmi.uml
• SysML_only_xmi.uml

The following Ecore files have been regenerated, along with the relevant Java files in the syntax-gen directory.

• SysML.ecore
• sysml_clean.ecore
• kerml.ecore