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UML Papyrus Association Designation

I am creating a UML class diagram in Papyrus, but I cannot understand the notation used for associations. When the association is configured for navigation, the tool adds a black dot on the tip of the arrow as the default symbol. I was able to remove the point by changing the owner of the member item from the classifier to the association. What is the conceptual difference between the two? I cannot find any discussion of the concept of a classifier in my UML book ...

Thanks!

PS: I use papyrus 4 on Eclipse Juno

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If you know that class A has some way of referring to B, for example, using some reference to a function or attribute, you make an arrow from A to B. Instance B is NAVIGABLE from A, but probably not attribute A .

If you know that attribute A is one or more references to instance B, you can draw not only an arrow, but also a “dot” at the end.

Very often people just use the arrow in both cases. But strict use of the point may provide additional information.

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As described in this UML Association Reference , the semantics of black dots:

It can be interpreted as indicating that the model includes a property of the type represented by the classifier affected by the point

(See link for more information)

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