Account for import of buildings in Porto Alegre:

Documented at: osm.wiki/Porto_Alegre,_Rio_Grande_do_Sul/Importa%C3%A7%C3%A3o_PMPA

Eventually collaborating on import of buildings at Rio Olympics Mapping Project:

Rio Olympics Mapping Project: osm.wiki/Rio_Olympics_Mapping

Documented at: osm.wiki/Rio_Olympics_%E2%80%93_Tutorial_para_Importa%C3%A7%C3%A3o_de_Edifica%C3%A7%C3%B5es