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Non-Navigable
An association end is non-navigable if it is marked with an x. This icon is optional and is used to indicate that the classifier at the other end (source) of the association has no access to the classifier at the end (target) marked with the x.
Explanation
When an association end is marked as non-navigable it does not mean that the association cannot be traversed at all; it simply means that the association does not provide a mechanism for this to happen. In practical terms it might require a source classifier to provide its own device for the traversal such as searching through the classifiers at the target end.
