Extract document information from a Portable Document Format (PDF) file.
A character string giving the path to a PDF file, or an
object of class
An object of class
PDF_info (which has useful format and print
methods), containing the information in the PDF Info dictionary
(title, subject, keywords, author, creator, producer, creation date,
modification date) as well as the number of pages and the page sizes,
whether the document is optimized (linearized), and the PDF version it
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