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semantics in UML  RSS feed

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I need the clarification on following question,

What is the incorrect answer (select one answer)?

(a) UML has only one grouping notation that is package. (b) Dependency is a semantic relationship.

(c) Association is a structural relationship. (d) Aggregation is a semantic relationship.

can someone explain what is semantic and structural relationship means?

Also the answer given to this question is (d) but i think (a) is also wrong because what about components? its also a groping notation know?

Thank you.
Posts: 979
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Hi Rez,

You have a structural relationship when a (parent) business object physically
contains another (child) business object.

On the other hand you have a semantical relationship when the (parent) business
object references the (child) business object, or vice versa.

Association, Aggregation, Composition, etc. are structural relationships
(therefore answer d is wrong)

The grouping relationship is used for objects that belong together based on common
characteristic: the package. The components are not a grouping relationship, but a
composition relationship which indicates that an object is made up of a number of other
objects (therefore answer a is right)

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