anchor.diff:   * Generic structure
    */
   
  -file    : body EOF 
  +file    : includes body EOF 
           ;
  +incl	: 'include' 
   body 	: (comp | defn)*
   	;
   defn    : 'define' ID params? portset '{' atom '}'  # defnAtomic
  
positive.code:  */
   
  ID      : [a-zA-Z] [a-zA-Z0-9]* ;
  OP	: ('=' | '!' | '<' | '>')+
  INT     : ( '0' | [1-9] [0-9]* ) ;
  STRING  : '\'' .*? '\'' ;
  FUNC    : [a-zA-Z] [a-zA-Z0-9_-.:]* ;
  
negative.code:                 ;
  		
  		
  e	: t OP e                               # cam_exInfix
  	| PO t				       # cam_exInfix
  	| t
  	;
  t 	: STRING                               # cam_termString
  