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# Field.containsExtension Method

Module: Field

## Definition

Returns a value indicating whether the field (or one of its child fields) contains an extension of the specified type.

    bool containsExtension(FieldExtensionType extensionType)

Parameters

`extensionType` FieldExtensionType
in The field extension type.

Returns

`bool`
A value indicating whether the field (or one of its child fields) contains the specified extension.

Exceptions

BiosealException
An error has occurred during Bioseal Library execution.