Common Mechanisms

1
Common Mechanisms

• Controlled methods of extending UML

2
Terms Concepts

• Note - graphical symbol for holding concepts
  which is attached to appropriate icon
• stereotypes
• creates equivalent of a new type supported by UML
• usually refinement or special case of something
  supported by UML
• syntax ltlt stereotype name gtgt or create new icon

3

• Tagged values
• create new properties
• apply to element - not instances
• analogous to a class-wide property
• syntax
• constraints
• create new semantics or change existing semantics
• can be informal (text) or formal (OCL - object
  constraint language)
• syntax

4
Common Modeling Techniques

• Modeling of a comment
• put comment in form of text in note place it
  next to thing to which it refers
• only make comments visible when they add
  information
• lengthy comment - put in external document link
  it to your note
• keep comments which record important assumptions
  decisions discard rest

5
(No Transcript)
6

• Modeling new building blocks
• reuse any previous constructed stereotypes if
  possible
• construct new one only if necessary
• identify UML supported item which is closest to
  new item being modeled
• determine properties semantics which are
  different from those of UML supported item
• represent them using tagged values constraints
• possibly construct new icon

7
(No Transcript)
8

• Modeling new properties
• reuse any previous constructed tagged types if
  possible
• construct new one only if necessary
• add tagged value to appropriate item

9

• Modeling new semantics
• reuse any previous constructed constraints if
  possible
• construct new one only if necessary
• write constraint using text or OCL