object_type,object_id,object_property_name,object_property_value
trip,ME:4bf028:trip:3-0,realtime_system,SIRI_STIF
trip,ME:4bf028:trip:4-0,realtime_system,SIRI_STIF
line,ME:line1,prop,val
route,ME:route2,another prop,some value
route,ME:route1,prop,val1