IFML — Metamodel for Events is not clear

Dear OMG colleagues,

I am currently reading about IFML Metamodel for my graduate thesis about Web Code Generator using IFML. I am reading about his particular notation (Events) but I'm having a hardtime reading the metamodel because :

1. The text isn't clear
2. Some of class diagram notation isn't clear enough.

To avoid a misinterpretation, I am hoping that you can give a clarification or a new Metamodel Diagram Image for me so that I can interpret it clearly.

Thank you for your attention,

Best Regards,
Hafiyyan Sayyid Fadhlillah,

Post-graduate Student,
Faculty of Computer Science Universitas Indonesia