Requirements Engineering Fundamentals, 2nd Edition by Pohl Klaus & Rupp Chris
Author:Pohl, Klaus & Rupp, Chris
Language: eng
Format: epub
Publisher: Rocky Nook
Published: 2015-05-19T16:00:00+00:00
Example of an Entity-Relationship Diagram
The entity-relationship model shown in figure 6-7 shows four entity types (i.e., classes of entities) and three relation types (i.e., classes of relationships). The individual entity types possess attributes that describe specific properties of the associated entities. For example, the entity type “traffic jam information” has the attributes “road”, “start”, and “length”, which depict the road on which a traffic jam is currently present, the GPS coordinates of the starting point of the jam, and the length of the jam. The relation type “queries” between the entity types “navigation device” and “traffic jam information” means that on the instance level, a relationship between a concrete navigation device and the information on zero or more concrete traffic jams exists. The cardinalities of the entity types with regard to the relation type “queries” means that a concrete navigation device can query information on an arbitrary amount (“N”) of traffic jams. In the other direction, any traffic jam information can be queried by an arbitrary number (“M”) of navigation devices.
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