I just realized that also the Wiki contains simply
Rio De Janeiro, Brazil, 22s53, 43w0613
Timezone LMT m43w0613 (is local mean time)
without marking explicitly minutes and seconds.
The associated chart finally does mark it clearly, see screen shot.
I have added this detail in the Help file at the longitude explanation:
http://www.astro.com/astro-databank/Help:XML_export_format#.3Cplace.3E