fld_cond  ::= 

  [(] 
  { full_fieldname | pos_spec } operator { 'char_string' | X'hex_string' | BLANKS } 
  [)] AND
  [(]
  { full_fieldname | pos_spec } operator { 'char_string' | X'hex_string' | BLANKS }
  [)]...

For information on how to read this syntax, see Appendix C.