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(type of entity) is part of the reference model. One must understand the concept of a wall in order to build a house that has walls.
* Entities and relationships: A reference model describes both types of entities (things that exist) and their relationships (how they connect, interact with one another, and exhibit joint properties). A list of entity types, by itself, doesn't provide enough information to serve as a reference model.
* Within an environment: A reference model does not attempt to describe "all things." A reference model

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