<graphviz>

digraph hal {

 node[shape="box"];
 playlist;
 work; file;
 fileset; host;
 playlist; channel; stream;
 mplayer;
 playlist_entry;

 playlist_entry->playlist;
 playlist_entry->clip;
 file->fileset;
 fileset->host;
 clip->work;

 edge [arrowhead="empty"];
 clip->file;
 stream->channel;
 channel->playlist;

}

</graphviz>