OCUP Miscellaneous basic notions

Notation Basics⌘

Diagram frame⌘

• Consist of a rectangle containing a header
• The header contains the diagram type (optional), name and parameter (optional)

Data type⌘

A data type is a type whose instances are identified only by their value - two instances with the same value are indistinguishable.

A DataType may contain attributes to support the modeling of structured data types.

PrimitiveType⌘

A primitive type defines a predefined data type, without any relevant substructure.

Four instances of primitive type:

• Boolean (true, false)
• Integer (..., -1, 0, 1, ...) symbol for infinity - *
• UnlimitedNatural (0, 1, 2, ...)
• String

Enumeration⌘

An enumeration is a data type whose values are enumerated in the model as enumeration literals.

Stereotype⌘

• Formal extensions to existing model elements
• They do not introduce new elements
• They add semantics to existing model elements
• Elements can have multiple stereotypes
• Stereotype name goes above or before element name enclosed in «»
  • special character not a pair of < or >
• Graphical symbols can be used to replace «»
• List of standard UML stereotypes: UML 2 Spec, Annex C: Standard Stereotypes

Questions⌘

1. Which data types are known in UML and what are they called?
2. What information is shown in a diagram header?
3. What is a stereotype? Does it define a new element?