anchor.diff:      ;
   
   quadsNotTriples
  -    : GRAPH varOrIRIref OPEN_CURLY_BRACE triplesTemplate? CLOSE_CURLY_BRACE
  +    : GRAPH varOrIRI OPEN_CURLY_BRACE triplesTemplate? CLOSE_CURLY_BRACE
       ;
       
   triplesTemplate
  
positive.code:     ;
  
  graphGraphPattern
      : GRAPH varOrIRIref groupGraphPattern
      ;
  
  serviceGraphPattern
      : SERVICE SILENT? varOrIRIref groupGraphPattern
      ;
      
  bind
  
negative.code:     ;
  
  describeQuery
      : DESCRIBE (varOrIRI+ | ASTERISK) datasetClause* whereClause? solutionModifier
      ;
  
  askQuery
  