# Extract Deleted Text Marked by Tracked Changes

The revision tracking feature in applications—such as Microsoft Word's Track Changes—marks changes to a document (typically, strikethrough for deleted text and underline for inserted text) and tracks each change by reviewer name and date. If revision tracking was enabled when text was deleted from a source document, you can configure Filter to extract the deleted text. Filter does not extract the reviewer name and revision date. Deleted text is excluded from the filtered output by default.

To extract deleted text from a document and include it in the filtered output, use the `IncludeRevisionMark` property. For example:

    if(inclRevisionMark == true)
    {
        objFilter.IncludeRevisionMark();
    }

To reset the flag and exclude deleted text from the filtered output, call the `ExcludeRevisionMark` method. For example:

    if(inclRevisionMark == false)
    {
        objFilter.ExcludeRevisionMark();
    }

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