anchor.diff:  	
   triplesNode
       : ^(COLLECTION graphNode+)
  -    | ^(TRIPLES_NODE ^(SUBJECT BLANK_NODE) propertyListNotEmpty)
  +    | ^(TRIPLES_NODE propertyListNotEmpty)
       ;
   
   graphNode
  
positive.code: 
  triplesSameSubjectPath
      : ^(TRIPLES_SAME_SUBJECT ^(SUBJECT varOrTerm) propertyListNotEmpty)
      | ^(TRIPLES_SAME_SUBJECT  triplesNode (^(SUBJECT BLANK_NODE) propertyListNotEmpty)?)
      ;
      
  path
  
negative.code:     ;   
      
  load 	  
      : ^(LOAD SILENT* iriRef graphRef?)
      ;
      
  clear
  