digraph G {
  rankdir=LR;
  bgcolor=transparent;

  node [shape="box", style="rounded", border=0, fontname="sans-serif"]; "nmm:MusicPiece";
  node [shape="ellipse", style="dashed", border=1, fillcolor="#000000"]; song, songTitle, album, albumTitle;
  edge [fontname="sans-serif", fontsize=10];

  song -> "nmm:MusicPiece" [label="rdf:type"];
  song -> songTitle [label="nie:title"];
  song -> album [label="nmm:MusicAlbum"];

  album -> albumTitle [label="nie:title"];
}
