def to_xml(xml_builder)
      attributes = {
          'metadata:type' => type,
      }

      if value.nil?
        attributes['metadata:null'] = 'true'
        xml_builder['data'].send(name.to_sym, attributes)
      else
        xml_builder['data'].send(name.to_sym, attributes, xml_value)
      end
    end
def to_xml(xml_builder)
      attributes = {
          'metadata:type' => type,
      }

      if value.nil?
        attributes['metadata:null'] = 'true'
        xml_builder['data'].send(name.to_sym, attributes)
      else
        xml_builder['data'].send(name.to_sym, attributes, xml_value)
      end
    end
Returns the XML representation of the property to the supplied XML
 builder.
 @param xml_builder [Nokogiri::XML::Builder]