d by us),
        - special (SlantFont and ExtendFont, only field that is double-quoted),
        - fontfile, encodingfile (optional, prefixed by <, <<, or <[; << always
          precedes a font, <[ always precedes an encoding, < can precede either
          but then an encoding file must have extension .enc; < and << also
          request different font subsetting behaviors but we ignore that; < can
          be separated from the filename by whitespace).

        special, fontfile, and encodingfile can appear in any order.
        )