XML fetching is not properly working with this URL

I can not get time data from this XML: http://datos.gijon.es/doc/transporte/busgijontr.xml (City bus times). It doesn't work even for the most basic //bus:minutos path, but I've successfully tested other XML webs. Maybe it has something to do with the first line? That <bus:BusGijonTr xmlns:bus="http://docs.gijon.es/sw/busgijon.asmx"> looks weird, Even though an XML checker says it is correctly formatted.

Any idea on this?