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Mastering Data Modeling: A User-Driven Approach by John Carlis

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Chapter 16. Labeling Links

Remember, an LDS is a vehicle for communication. If it is not clear what the entities, attributes, and relationships mean, the LDS fails to communicate. This chapter discusses how to add link labels to relationships whose meaning is not obvious without them.

Each relationship’s official name conveys most of the relationship’s meaning. Equivalent to the relationship name, a single sentence conveys the same meaning. For example, for the relationship named desire for a skill by a creature, the equivalent sentence is “Creature desires skill.”

The relationship name and the equivalent sentence convey most but not all of the relationship’s meaning. They do convey what each instance of the relationship means. They do not ...

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