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Extra resources for Database modeling & design : logical design
The process may be a workflow followed by people, organizations, or other physical things. Alternatively, the process may be an algorithm implemented in software. The syntax and the semantics of the UML constructs are the same, regardless of the process described. Our examples draw from workflows that are followed by people and organizations, since these are more useful for the logical design of databases. 1 Activity Diagram Notation Description Activity diagrams include notation for nodes, control flow, and organization.
As a result, UML does not have an icon representing a primary key. However, UML is extensible. The meaning of an element in UML may be extended Car Primary key as a stereotype «pk» vin mileage color Composition example with primary keys Invoice «pk» inv_num customer_id inv_date 1 .. 1 Class Diagrams with a stereotype. Stereotypes are depicted with a short natural language word or phrase, enclosed in guillemets: « and ». We take advantage of this extensibility, using a stereotype «pk» to designate primary key attributes.
We will look shortly at the other classes and how they are related. The Media Group Artist 2 .. * 0 .. * Composer Lyricist 0 .. * 1 .. * 1 .. * Song Musician * 1 .. 1 Class Diagrams package contains classes that physically hold the recordings of the music. The Distribution package contains classes that bring the media to you. The contents of a package can be expanded into greater detail. 9. A Group is an aggregation of two or more Artists. As indicated by the multiplicity between Artist and Group, [0 ..