Special
emptycheck	Check whether a specified area on the page is empty, i.e. does not contain any text, vector graphics or image.
extract_highlighted_text	Extract text under Highlight annotations.
get_attachments	Extract the text from the document and recursively from all embedded PDF attachments.
identify_ocr	Classify the pages in a document based on the page content.
multiple_documents	Generalized form of the simple text extractor for multiple documents.
region_of_interest	Restrict text extraction to a particular "region of interest", i.e. some area on the page based on knowledge about the document layout.