code: private final void writeIndentation() throws IOException {
  
          // Write indentation only if there is any
          if (_indentation.length() > 0) {
              int count = _elementStackSize - 1;
              for (int i = 0; i < count; i++) {
                  _out.write(_indentation);
              }
          }
      }
docs: Writes the indentation to the output stream.
  
  @throws IOException if an I/O error occurs.