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hello this is kenny moore from taggedpdf.com continuing a series of short tutorials intended to help optimize pdf documents for assistive technology and mobile device users by meeting the new pdf accessibility requirements of the 508 refresh in this video we will explore a warning encountered when using the excellent free pdf accessibility checker pack 2. and the warning is this one document structure element found which is not a root element the category of this warning is logical structure structure tree the failure of condition in the matterhorn protocol reads the structure type and attributes of a structure element are not semantically appropriate for the structure element now this video will present a suggestion for resolving this error using docHub pro and the demo will use this example pdf which you would like you can download and use to practice solving this warning in pack 2 i have the example pdf loaded so i can click start and you can see that pack 2 gives us this cau