· Entity: means any distinguishable object to be represented in the database which we wish to record information .
· Interrelationships : they allow you to link those entities. Are represented by connecting lines or arcs. In addition, part of the information, as well as the basic entities. Are bidirectional
are represented in the database, and are the characteristics of an entity. A given property could be very simple in nature, or possessing an internal structure of arbitrary complexity. BD current systems are not well suited to handle complex properties such as diagrams or texts.
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