public override TReturn Accept <TContext, TReturn>(ReSharper.NTriples.Tree.TreeNodeVisitor <TContext, TReturn> visitor, TContext context)
 {
     return(visitor.VisitVariableIdentifier(this, context));
 }
 public override void Accept <TContext>(ReSharper.NTriples.Tree.TreeNodeVisitor <TContext> visitor, TContext context)
 {
     visitor.VisitVariableIdentifier(this, context);
 }