code: def OxmlElement(nsptag_str, nsmap=None):
      
      nsptag = NamespacePrefixedTag(nsptag_str)
      nsmap = nsmap if nsmap is not None else nsptag.nsmap
      return oxml_parser.makeelement(nsptag.clark_name, nsmap=nsmap)
docs: Return a 'loose' lxml element having the tag specified by *nsptag_str*.
      *nsptag_str* must contain the standard namespace prefix, e.g. 'a:tbl'.
      The resulting element is an instance of the custom element class for this
      tag name if one is defined.