text: class Mimetype:
      OCTET_STREAM = 'application/octet-stream'
      XML = 'application/xml'
      ZIP = 'application/zip'
  
      EPUB = 'application/epub+zip'
      FB2 = 'application/fb2+xml'
      FB2_ZIP = 'application/fb2+zip'
      PDF = 'application/pdf'
      MSWORD = 'application/msword'
      MOBI = 'application/x-mobipocket-ebook'
      DJVU = 'image/vnd.djvu'
      TEXT = 'text/plain'
      RTF = 'text/rtf'
  