text: HTML.Doctype
  TYPE: string/null
  DEFAULT: NULL
  --DESCRIPTION--
  Doctype to use during filtering. Technically speaking this is not actually
  a doctype (as it does not identify a corresponding DTD), but we are using
  this name for sake of simplicity. When non-blank, this will override any
  older directives like %HTML.XHTML or %HTML.Strict.
  --ALLOWED--
  'HTML 4.01 Transitional', 'HTML 4.01 Strict', 'XHTML 1.0 Transitional', 'XHTML 1.0 Strict', 'XHTML 1.1'
  --# vim: et sw=4 sts=4
  