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that is correct. (for making a class diagram)
Out of your use case descriptions you make your class diagram.
The class diagram gives you the objects to work with in your sequence diagram, the logic of the use case diagram gives you the existancy of the object.
With other words: The sequence diagram gives you the existancy of the objects out of the perception of the actor(s) in time, by use of the flow of information between the objects (and/or actor(s)).
(I'm away untill friday, but if you like an example I'll be glad to make one when I'm back.)
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Amerika by Franz Kafka
“As Karl Rossman, a poor boy of sixteen who had been packed off to America by his parents because a servant girl had seduced him and got herself a child by him, stood on the liner slowly entering the harbour of New York, a sudden burst of sunshine seemed to illumine the Statue of Liberty, so that he saw it in a new light, although he had sighted it long before. The arm with the sword rose up as if newly stretched aloft, and round the figure blew the free winds of heaven.”
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