def value=(value)
      if xml_element.present?
        xml_element.children.first.content = value
      else
        xml_element = Nokogiri::XML::Element.new(element_tag.to_s, xml_document)
        xml_element.content = value
        xml_parent_element.add_child(xml_element)
      end
    end
def value=(value)
      if xml_element.present?
        xml_element.children.first.content = value
      else
        xml_element = Nokogiri::XML::Element.new(element_tag.to_s, xml_document)
        xml_element.content = value
        xml_parent_element.add_child(xml_element)
      end
    end
Setter Method