The Unified Modeling Language User Guide SECOND EDITION [Electronic resources] نسخه متنی

Chapter 6. Common Mechanisms

In this chapter

• Notes

• Stereotypes, tagged values, and constraints

• Modeling comments

• Modeling new building blocks

• Modeling new properties

• Modeling new semantics

• Extending the UML

The UML is made simpler by the presence of four common mechanisms that apply throughout the language: specifications, adornments, common divisions, and extensibility mechanisms. This chapter explains the use of two of these common mechanisms: adornments and extensibility mechanisms.

Notes are the most important kind of adornment that stands alone. A note is a graphical symbol for rendering constraints or comments attached to an element or a collection of elements. You use notes to attach information to a model, such as requirements, observations, reviews, and explanations.