o  The field name you assign can be up to 31 characters from the set
      A-Z,  0-9,  _,  and $.  The first character must be a letter from
      A-Z, and the last character can not be _ or $.  You can use 8-bit
      alphabetic characters in field names.

   o  If you use an asterisk (*) instead of a field-name, you create an
      unnamed field.

   o  If you do not specify a data type for  the  STRUCTURE,  the  CDDL
      assigns it the UNSPECIFIED data type.

   o  Subordinate  field  description  statements  describe  contiguous
      portions of the field described by the STRUCTURE.

   o  There  must  be  at  least  one  subordinate  field   description
      statement.    A   subordinate  field  can  be  an  elementary,  a
      STRUCTURE, a COPY, or a VARIANTS field.

   o  CDDL accepts the keyword GROUP as a synonym  for  STRUCTURE,  but
      the compiler issues a warning when you use GROUP.

   o  You must terminate the STRUCTURE  and  the  END  statements  with
      periods.