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UML Sequence diagram and class diagram

807580Apr 6 2010 — edited Apr 11 2010

Making UML sequence diagram I didn't put activation rectangle in first object(UI) assuming that this object is always active. Is this correct? Not according to my tutor and I have to quote him:
"Finally, you have no activation rectangle for the userInterface instance, so the initial message could never have been sent."

Another thing he is picking me at is and I'm quoting him:
"In class diagram the generalisation arrow heads should be open triangles."
In my opinion there isn't strictly said that they must be open triangles especially when software lets you choose their form. Looking forward to hear your opinions.

Thanks for answers.

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Locked on May 9 2010

Added on Apr 6 2010

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