+ node_el = XML::Node.new "nd"
+ node_el["ref"] = nd_id
+ el << node_el
+ end
+
+ add_tags_to_xml_node(el, way.way_tags)
+
+ el
+ end
+
+ def xml_for_relation(relation)
+ doc = OSM::API.new.xml_doc
+ doc.root << xml_node_for_relation(relation)
+ doc
+ end
+
+ def xml_node_for_relation(relation)
+ el = XML::Node.new "relation"
+ el["id"] = relation.id.to_s
+
+ add_metadata_to_xml_node(el, relation, {}, {})
+
+ relation.relation_members.each do |member|
+ member_el = XML::Node.new "member"
+ member_el["type"] = member.member_type.downcase
+ member_el["ref"] = member.member_id.to_s
+ member_el["role"] = member.member_role
+ el << member_el
+ end
+
+ add_tags_to_xml_node(el, relation.relation_tags)
+
+ el
+ end
+
+ def add_metadata_to_xml_node(el, osm, changeset_cache, user_display_name_cache)
+ el["changeset"] = osm.changeset_id.to_s
+ el["redacted"] = osm.redaction.id.to_s if osm.redacted?
+ el["timestamp"] = osm.timestamp.xmlschema
+ el["version"] = osm.version.to_s
+ el["visible"] = osm.visible.to_s
+
+ if changeset_cache.key?(osm.changeset_id)
+ # use the cache if available
+ else
+ changeset_cache[osm.changeset_id] = osm.changeset.user_id
+ end
+
+ user_id = changeset_cache[osm.changeset_id]
+
+ if user_display_name_cache.key?(user_id)
+ # use the cache if available
+ elsif osm.changeset.user.data_public?
+ user_display_name_cache[user_id] = osm.changeset.user.display_name
+ else
+ user_display_name_cache[user_id] = nil
+ end
+
+ unless user_display_name_cache[user_id].nil?
+ el["user"] = user_display_name_cache[user_id]
+ el["uid"] = user_id.to_s
+ end