code: public void addRangeExpr(final INodeReadTrx mTransaction) {
  
          assert getPipeStack().size() >= 2;
  
          final AbsAxis mOperand2 = getPipeStack().pop().getExpr();
          final AbsAxis mOperand1 = getPipeStack().pop().getExpr();
  
          final AbsAxis axis = new RangeAxis(mTransaction, mOperand1, mOperand2);
          if (getPipeStack().empty() || getExpression().getSize() != 0) {
              addExpressionSingle();
          }
          getExpression().add(axis);
  
      }
docs: Adds a range expression to the pipeline.
  
  @param mTransaction
  Transaction to operate with.