|  
                   [RULE rule_name 
                     {"string" 
                    | FILE "filespec"}] 
                    
                  RULE rule_name
                   Rules are optional. If defining a rule, the RULE keyword 
                    and rule name are required. 
                  This is an unambiguous name, up to 64 characters and can 
                    contain letters, A - Z (case insensitive) or numbers. rule_name 
                    must begin with a letter. 
                    
                   |