public static final Key KEY_FIXED_LAYERS = new KeyOf(String[].class, "FIXED_LAYERS");
public static final Key KEY_MUTATOR = new KeyOf(DiagramMutator.class, "MUTATIONS");
public static final Key KEY_FIXED_LAYERS = new KeyOf(String[].class, "FIXED_LAYERS");
public static final Key KEY_MUTATOR = new KeyOf(DiagramMutator.class, "MUTATIONS");