@Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("icpnCode", getIcpnCode())
        .add("title", getTitle())
        .add("byArtists", getByArtists())
        .toString();
  }
POJO for https://schema.org/MusicRelease
portability-types-common/src/main/java/org/datatransferproject/types/common/models/music/MusicRelease.java