HP System Dictionary/XL General Reference Manual Vol 1 (32256-90004)

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Figure 3-1. E-R Model
Within System Dictionary, the E-R model has been enhanced and also includes entity types,
relationship types, relationship classes, and attributes. These are definitions within the structure
of System Dictionary, and they support the creation, maintenance, and retrieval of the entities and
relationships, which comprise the bulk of the definitions within the dictionary. The components of the E-R
model are described on the following pages. The E-R structure is illustrated in Figure 3-2.