### 29.1.1. Definition

CEL expressions can be defined using any combination of constants, variables, mathematical functions and other CEL expressions. For details, see CFX Expression Language (CEL) in the CFX Reference Guide.

Tip: Right-clicking in the Definition window provides access to a list of all available variables, expressions, locators, functions and constants. Although valid values can be chosen from each of the various lists, the validity of the expression itself is not checked until you click Apply.

Additional Variables can be used in expressions as soon as they have been completely specified. After they have been created, they appear in the list of available variables when right-clicking in the Definition window. For details, see:

- CFX Expression Language (CEL) in the CFX Reference Guide

- CEL Operators, Constants, and Expressions in the CFX Reference Guide.

Click Reset to undo changes made after opening the CEL expression for editing.

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