# Schema Level Diagram

A schema level diagram consist of the representation of single and multiple schemas and their interfaces.
The contents of an EXPRESS-G schema level diagram are limited to the schemas comprising the diagram and the schema interface (see Figure 1). The following are included:

- scehmas that refer to another schema by means of USE;
- schemas that refer to another schema by means of REFERENCE;
- names of the things that are referenced or used.

Figure 1. Schema level diagram.
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