# File lib/rbrainz/webservice/includes.rb, line 230
      def initialize(includes)
        Utils.check_options includes, 
            :aliases, :artist_rels, :release_rels, :track_rels, :label_rels,
            :url_rels, :tags, :user_tags, :ratings, :user_ratings
        @parameters = Array.new
        @parameters << 'aliases'      if includes[:aliases]
        @parameters << 'artist-rels'  if includes[:artist_rels]
        @parameters << 'release-rels' if includes[:release_rels]
        @parameters << 'track-rels'   if includes[:track_rels]
        @parameters << 'label-rels'   if includes[:label_rels]
        @parameters << 'url-rels'     if includes[:url_rels]
        @parameters << 'tags'         if includes[:tags]
        @parameters << 'user-tags'    if includes[:user_tags]
        @parameters << 'ratings'      if includes[:ratings]
        @parameters << 'user-ratings' if includes[:user_ratings]
      end