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Do generalization arrows in class diagram has to be strictly open or is there a margin of tolerance on style of this arrows?
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Talking about UML designs without an image is like talking about girl without ...... :-) Here is the picture of UML2 connectors in the class diagram:
alt text http://www.forum-omondo.com/documentation_eclipseuml_2008/connectors_uml2.png
Open arrows are used together with a dashed/dotted line to represent dependencies.
I can't think of a standard way to use them with a regular line.
Furthermore, as Martin Fowler clearly indicates in UML Distilled, UML is just a notation. If the people that will read your diagrams are aware that
open arrow = closed arrow, then feel free to use it. There is no strictness in UML.Each element in UML has to strictly follow the normative notation proposed in the standard. With so many symbols there is a high risk that a notation variant for a symbol coincides with the normative representation of another one