Text_Input_Converter

   The Text input converter converts a Text (ISO Latin1) input file
   to an intermediate format that is then converted to the specified
   output file format. The information in the text input file maps
   directly to an intermediate representation. Line breaks and form
   feeds are mapped to DDIF directives. One or more contiguous blank
   lines are interpreted as end-of-paragraph markers.

   If the text input file was entered as a DEC Multinational
   Character Set file on a character-cell terminal or terminal
   emulator, the following conversions occur:

   Original Character      Converted Character

   Concurrency sign        Diaeresis
   Capital OE ligature     Multiplication sign
   Capital Y with          Capital Y with acute accent
   diaeresis
   Small oe ligature       Division sign
   Small y with diaeresis  Y with acute accent

   The text input file does not lose any text when converted
   to the intermediate representation because no structure
   information is contained in a text file. All nonprinting
   characters are converted to space characters. For example,
   characters introducing ANSI escape characters are converted to
   space characters. There is no attempt to interpret ANSI escape
   sequences.