In the KML document (release 2021-12), par. 7.1.4 (KerML Element Hierarchy), the following elements are not shown:
1) FeatureReferenceExpression :> Expression;
2) OperatorExpression :> InvocationExpression;
3) PathStepExpression :> OperatorExpression;
4) PathSelectExpression :> OperatorExpression;
In the KML document (release 2021-12), par. 7.1.4 (KerML Element Hierarchy), the following elements are not shown: 1) FeatureReferenceExpression :> Expression; 2) OperatorExpression :> InvocationExpression; 3) PathStepExpression :> OperatorExpression; 4) PathSelectExpression :> OperatorExpression;
Please add them to the figure for completeness.