(*
 * This formulation of the CIF2-file production accepts the end of the
 * input as whitespace for the purpose of satisfying the CIF 2.0
 * requirement that the version comment be followed by whitespace.
 * It incorporates the CIF 2.0 limitation (also in CIF 1.1) that no
 * line of a CIF may exceed 2048 characters.
 *)
CIF2-file = ( file-heading, [ line-term, [
   wspace-any, data-block, 
   { wspace,   data-block }
], [ wspace ], [ comment ] ] )
- ( { allchars }, 2049 * char, { allchars } );

file-heading = [ ?U+FEFF? ], magic-code, { inline-wspace } ;