digraph world {
  "L.dtd" -> "http://rddl.org/L" [ label="validates"];
  "http://rddl.org/L" -> "L.css" [ label="presentation"];

  "L.css" -> "media:textCss" [ label="rddl:nature" ];
  "L.dtd" -> "media:appXMLDTD" [ label="rddl:nature" ];

  "validates" -> "rddl:Purpose" [ label="rdf:type" ];
  "presentation" -> "rddl:Purpose" [ label="rdf:type" ];
}