2   def add_metadata_to_xml_node(el, osm, changeset_cache, user_display_name_cache)
 
   3     el['changeset'] = osm.changeset_id.to_s
 
   4     el['redacted'] = osm.redaction.id.to_s if osm.redacted?
 
   5     el['timestamp'] = osm.timestamp.xmlschema
 
   6     el['version'] = osm.version.to_s
 
   7     el['visible'] = osm.visible.to_s
 
   9     if changeset_cache.key?(osm.changeset_id)
 
  10       # use the cache if available
 
  12       changeset_cache[osm.changeset_id] = osm.changeset.user_id
 
  15     user_id = changeset_cache[osm.changeset_id]
 
  17     if user_display_name_cache.key?(user_id)
 
  18       # use the cache if available
 
  19     elsif osm.changeset.user.data_public?
 
  20       user_display_name_cache[user_id] = osm.changeset.user.display_name
 
  22       user_display_name_cache[user_id] = nil
 
  25     unless user_display_name_cache[user_id].nil?
 
  26       el['user'] = user_display_name_cache[user_id]
 
  27       el['uid'] = user_id.to_s
 
  31   def add_tags_to_xml_node(el, tags)
 
  33       tag_el = XML::Node.new('tag')