/// <inheritdoc />
        public override void VisitRelation(Entities.Relation relation)
        {
            string actualValue;
            var    modelRelation = new Relation()
            {
                Id   = relation.Id,
                Tags = relation.Tags,
            };

            if (relation.Tags != null && relation.Tags.TryGetValue("type", out actualValue) &&
                actualValue == "multipolygon")
            {
                // TODO use object pool
                modelRelation.Areas = new List <Area>(relation.Members.Count);
                MultipolygonProcessor.FillAreas(relation, modelRelation.Areas);
            }
            ModelLoader.LoadRelation(Tile, modelRelation);
        }