static DoubleRect libreOffice_rect(L<S> tag) {
  ret libreOffice_rect(get(tag, 1));
}

static DoubleRect libreOffice_rect(S tag) {
  S x = xml_getArg(tag, "svg:x");
  S y = xml_getArg(tag, "svg:y");
  S w = xml_getArg(tag, "svg:width");
  S h = xml_getArg(tag, "svg:height");
  if (x != null && y != null && w != null && h != null)
    ret new DoubleRect(
      libreOffice_parseMeasure(x),
      libreOffice_parseMeasure(y),
      libreOffice_parseMeasure(w),
      libreOffice_parseMeasure(h));
  null;
}