> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Predefined Field Region Description Variables

> Predefined variables for describing field regions in FlexiLayout, including IsNull, IsSuspicious, OutputRegion, OutputInstances, and OutputValue.

| Name              | Description                                                                                                                                                                                                                                                                                                                                 |
| :---------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `IsNull`          | Variable of type Logic. The value of the variable determines whether the field region has been found or not. The IsNull variable is pre-initialized with value `False`, which means that the field region has been found. To instruct the program that the block has not been found, set the value to `True`. Used for fields of all types. |
| `IsSuspicious`    | Variable of type Logic. Its value indicates whether the field has been detected reliably. The IsSupicious variable is pre-initialized with value `False`, which means that the field has been found. To tell the program that the field has been detected unreliably, set the value to `True`. Used for fields of all types.                |
| `OutputInstances` | Variable of type HypothesisInstances that is used for fields of the Repeating Group type. The value of the variable defines the detected field region. The region of a field built from the instances of elements and subelements of a repeating group is discontinuous.                                                                    |
| `OutputRegion`    | Variable of type Region. The value of the variable determines the region of the block.                                                                                                                                                                                                                                                      |
| `OutputValue`     | Variable of type String. Allows you to set the value of the field as a string. Can be set when the field region is not set.                                                                                                                                                                                                                 |