anchor.diff:  	
   triplesNode
       : ^(COLLECTION graphNode+)
  -    | ^(TRIPLE objectList)
  +    | ^(PROPERTY_LIST propertyListNotEmpty)
       ;
   
   graphNode
  
positive.code:     ;
      
  quads
      : triplesTemplate? ( quadsNotTriples triplesTemplate? )*
      ;
      
  quadsNotTriples
  
negative.code:     ;
  
  varOrTerm
      : var | graphTerm | BLANK_NODE
      ;
  
  varOrIRIref
  