docs: def serialize_to_display(self, xslt_url=None):
          """Serialize to a pretty printed Unicode str, suitable for display.
  
          Args:   xslt_url: url     Optional link to an XSLT stylesheet. If provided, a
          processing instruction for     the stylesheet is included in the XML prolog.
  
          """
          return d1_common.xml.serialize_to_xml_str(
              self.get_pyxb(), pretty=True, xslt_url=xslt_url
          )