# Layer Diagram - Overview

Used to illustrate layerings, i.e. quadratic
relations.
Elements of a set thus appear in two different, hierarchically distinct, roles in the relation.
Thus an ordering criterion exists, so that an element can be ordered as a
junior of another element. E.g. if a set consists of routines in a computer program and the relation is "A calls B", routines can assume the role of the caller or the callee.
## Layer

## Shared

*These masters are part of all stencil sets, not only Layer Diagram.*