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## Using Parameters

### Parameters in Properties of Components

When you have defined, for example, a `FILTER_EXPRESSION` (parameter) which means a filter expression, you can use `${FILTER_EXPRESSION}` instead of defining the filter expression in each Filter.

Figure 36.28. Filter Component Configured by Graph Parameter

CTL2 expressions can be used as a parameter value. See Parameters with CTL Expressions (Dynamic parameters).

### Using Parameters in CTL

If you use parameters in CTL, you should get their value via `getParamValue("MyParameter")`. Be careful when working with them, you can also use escape sequences for specifying some characters.

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