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Foxit PDF SDK
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Underline annotation is a kind of text markup annotation, which is shown as a underline under the text in a PDF document.
Class fsdk.Underline is derived from TextMarkup and offers function to reset appearance stream of a underline annotation. For a underline annotation, quadrilaterals are required. So please ensure that a underline annotation has valid quadrilaterals before resetting its appearance stream; otherwise the underline annotation cannot be reset appearance stream.