UML仕様2.5（まだベータ版）を読んでいると
Some tools may use the different Images for different purposes: the icon replacing the box, fo r the reduced-size icon inside the box, for icons within tree browsers, etc. Alternatively, depending on the Image format, tools may choose to scale one single Image into different sizes for these different purposes.
Some model elements already use an icon for their default presentation. A typical example of this is the Actor model element,
which uses the “stickman” icon. When a Stereotype with an icon is applied to such a model element, the Stereotype’s icon replaces
the default presentation icon within diagrams.
UML 認定 (2007 年、155 ページ) も参照してください。
UML 2 uses several semantic variation points, which means that UML 2 leaves the semantics intentionally open at this point. The interpretation is left up to the environment in which the model is used.
私の質問:
1)簡単な例（上記のツールとは関係ありません）を使用して、意味の変化点を明確にしていただけますか?
2)どのように使用すればよいsemantic variation pointsですか (ガイドラインや制限はHowありwhereますか?