Terms and Concepts
术语和概念
A note is a graphical symbol for rendering constraints or comments attached to an element or a collection of elements. Graphically, a note is rendered as a rectangle with a dog-eared corner, together with a textual or graphical comment.
A stereotype is an extension of the vocabulary of the UML, allowing you to create new kinds of building blocks similar to existing ones but specific to your problem. Graphically, a stereotype is rendered as a name enclosed by guillemets ( French quotation marks of the form
Optionally the stereotyped element may be rendered by using a new icon associated with that stereotype.
任意地模式化元件可以通过使用关联到那个模式化的新图标表现．
A tagged value is a property of a stereotype, allowing you to create new information in an element bearing that stereotype. Graphically, a tagged value is rendered as a string of the form name=value within a note attached to the object.
A constraint is a textual specification of the semantics of a UML element, allowing you to add new rules or to modify existing ones. Graphically, a constraint is rendered as a string enclosed by brackets and placed near the associated element or connected to that element or elements by dependency relationships. As an alternative, you can render a constraint in a note.
，怕仍是不能。于是他们比任何人都看的清楚，又比任何人都看的不确切。
