When to use memberEnd and when navigableOwnedEnd (in Altova notation) in an UML class diagram?

Posted by Ivan on Stack Overflow See other posts from Stack Overflow or by Ivan
Published on 2010-05-23T10:35:39Z Indexed on 2010/05/23 10:40 UTC
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I've download a trial of Altova UModel and am starting using UML. As a practical beginning I am modelling a personal information manager application, which includes a web bookmark managing.

A Bookmark can belong to many (or no) Tags at once and a Tag can contain many (or no if all the bookmarks it contained were deleted) bookmarks. The relation has to be both-way navigable - a user has to be able to see all Bookmarks with a particular Tags ans all Tags of a Bookmark.

What is the correct UML relation between Bookmark and Tag classes?

As far as I understand UML now, it is an Association (not an Aggregation). But for a 2-way navigable many-to-many relation I can specify ends roles as "memberEnd" or "when navigableOwnedEnd", graphically the connection looks the same in both cases (an arrow) (which as I understand means navigability) but a property appears in the class box in case only when "memberEnd" is used.

How should I specif it in the model If I mean both-way navigable many-to-many relation there?

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