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For illustrative purposes, Figure 1 and Figure 2 show an EXPRESS-G diagram for a single EXPRESS schema. The schema is an example of an abstraction of a person. The graphical diagram is divided into two pages to illustrate the use of multiple pages. The example abstraction assumes that a person has certain defining characteristics, including a first name, a last name, an optional nickname, date of birth, and a description of their hair. A person is either male or a female. A male may have a female wife; in which case the female has a male husband. A person may have children who also are persons.

Figure 1: Page 1 of 2 of a complete entity level diagram of an abstraction of a person.Image Removed

Figure 2: Page 2 of 2 of a complete entity level diagram of an abstraction of a person