Import multipolygon yards

import/openrailwaymap.lua

@@ -1770,6 +1770,39 @@ function osm2pgsql.process_relation(object)
       way = object:as_multipolygon(),
     })
   end
+
+  local station_feature, station_state, name = railway_feature_and_state(tags, railway_station_values)
+  if station_feature and tags.type == 'multipolygon' then
+    local position, position_exact, line_positions = find_position_tags(tags)
+
+    for station, _ in pairs(station_type(tags)) do
+      stations:insert({
+        id = string.format("%s-%d-%s", object.type, object.id, station),
+        way = object:as_multipolygon(),
+        feature = station_feature,
+        state = station_state,
+        name = name,
+        station = station,
+        name_tags = name_tags(tags),
+        map_reference = map_station_reference(tags),
+        references = station_references(tags),
+        operator = split_semicolon_to_sql_array(tags.operator),
+        owner = tags.owner,
+        network = split_semicolon_to_sql_array(tags.network),
+        position = to_sql_array(map(parse_railway_positions(position, position_exact, line_positions), format_railway_position)),
+        yard_purpose = split_semicolon_to_sql_array(tags['railway:yard:purpose']),
+        yard_hump = tags['railway:yard:hump'] == 'yes' or nil,
+        wikidata = tags.wikidata,
+        wikimedia_commons = wikimedia_commons,
+        wikimedia_commons_file = wikimedia_commons_file,
+        image = image,
+        mapillary = tags.mapillary,
+        wikipedia = tags.wikipedia,
+        note = tags.note,
+        description = tags.description,
+      })
+    end
+  end
 end
 
 function osm2pgsql.process_gen()

import/test/test_import_station.lua

@@ -214,3 +214,20 @@ assert.eq(osm2pgsql.get_and_clear_imported_data(), {
     { id = 'way-123-train', feature = 'station', state = 'present', map_reference = 'ref', references = { ['railway-ref'] = 'ref' }, operator = '{"operator"}', station = 'train', name_tags = { name = 'name' }, name = 'name', way = way },
   },
 })
+
+osm2pgsql.process_relation({
+  id = 123,
+  type = 'relation',
+  tags = {
+    ['type'] = 'multipolygon',
+    ['railway'] = 'yard',
+  },
+  as_multipolygon = function()
+    return way
+  end,
+})
+assert.eq(osm2pgsql.get_and_clear_imported_data(), {
+  stations = {
+    { id = 'relation-123-train', way = way, name_tags = {}, station = 'train', state = 'present', references = {}, feature = 'yard' },
+  },
+})