The main contents of a form ftxt is in its character stream "chrs" chunks.
Formatting property chunks may also appear.  The only formatting property
yet defined is "fons", a font specifier.  a form ftxt with no chrs
represents an empty text stream.  A FORM FTXT may contain nested IFF
forms, lists, or cat s, although a "stripping" reader (see section 3) will
ignore them.

 character sets 
 control sequences 
 data chunk chrs 
 property chunk fons 
 future properties 
 positioning units