anchor.diff:      ;
   
   describeQuery
  -    : DESCRIBE (varOrIRIref+ | ASTERISK) datasetClause* whereClause? solutionModifier
  +    : DESCRIBE (varOrIRI+ | ASTERISK) datasetClause* whereClause? solutionModifier
       ;
   
   askQuery
  
positive.code:     : var | graphTerm
      ;
  
  varOrIRIref
      : var | iri
      ;
  
  
negative.code:     ;
  
  quadsNotTriples
      : GRAPH varOrIRI OPEN_CURLY_BRACE triplesTemplate? CLOSE_CURLY_BRACE
      ;
      
  triplesTemplate
  