anchor.diff:  styleSheet
   	: charSet?
   	  imports*
  -	  bodylist
  +	  body*
   	  EOF
  -		-> ^(N_StyleSheet charSet? imports* bodylist?)
  +		-> ^(N_StyleSheet charSet? imports* body*)
   	;
   	
   // -----------------
  
positive.code: media
  	: MEDIA_SYM^ media_query_list?
  		LBRACE!
  			bodyset*    // This is from CSS3
  		RBRACE!
  	;
  
  
negative.code: //
  media_query_list
  	: media_query (COMMA media_query)*
  		-> ^(N_MediaQuery media_query) +
  	;
  
  // We are not studying content of media query (as AND, NOT and ONLY tokens are not recognized)
  