Ternary relationship?


I’m wondering if I have a ternary relationship situation here. Here are my classes;

Coal Mine
Company (Role = owner of a coal mine)
Permit (Sanctions development operations of the company at a coal mine)

Here’s what I think it should look like;

Company------------------Coal Mine

Mulitple companies could own a mine over time (never overlapping terms). A permit for a mine is ammended when ownership changes.
A company may own a mine but there may not be a permit to
sanction development operations.

So any thoughts?


Thanks for your post. You can use N-ary association for ternary relationship (see attached image). If there is any further inquiry, please feel free to ask.

Best regards,
Lilian Wong