Aggiunto graph

graph/DecorablePosition.java

@@ -0,0 +1,15 @@
+package graph;
+
+import map.Map;
+import position.Position;
+
+/**
+ * An interface for a position that can be marked with an arbitrary
+ * number of decorations.
+ *
+ * @author Roberto Tamassia, Michael Goodrich
+ */
+
+public interface DecorablePosition<E>   extends Position<E>, Map<Object,Object> {}
+ // no new methods needed -- this is a mixture of Position and Map.
+