code: def OxmlElement(nsptag_str, attrs=None, nsdecls=None):
      
      nsptag = NamespacePrefixedTag(nsptag_str)
      if nsdecls is None:
          nsdecls = nsptag.nsmap
      return oxml_parser.makeelement(
          nsptag.clark_name, attrib=attrs, nsmap=nsdecls
      )
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. A dictionary of attribute values may be
      provided as *attrs*; they are set if present. All namespaces defined in
      the dict *nsdecls* are declared in the element using the key as the
      prefix and the value as the namespace name. If *nsdecls* is not provided,
      a single namespace declaration is added based on the prefix on
      *nsptag_str*.