anchor.diff:      ;
   
   deleteWhere
  -    : DELETE WHERE quadData
  +    : DELETE WHERE quadPattern
       ;
       
   modify
  -    : (WITH iriRef)? (deleteClause insertClause? | insertClause) usingClause* WHERE groupGraphPattern
  +    : (WITH iri)? (deleteClause insertClause? | insertClause) usingClause* WHERE groupGraphPattern
       ;
     
   deleteClause
  
positive.code:     ;  	
  
  pathOneInPropertySet
      : INVERSE? (iriRef | A)
      ;
  	
  integer
  
negative.code:     ;
  
  graphTerm
      : iri | rdfLiteral | numericLiteral | booleanLiteral | blankNode | nil
      ;
      
  nil
  