int numDKeys = in.readInt();
v.visitEnclosingElement(ImageElement.DELEGATION_KEYS,
ImageElement.NUM_DELEGATION_KEYS, numDKeys);
for(int i =0; i < numDKeys; i++) {
DelegationKey key = new DelegationKey();
key.readFields(in);
v.visit(ImageElement.DELEGATION_KEY, key.toString());
}
v.leaveEnclosingElement();
v.visit(ImageElement.DELEGATION_TOKEN_SEQUENCE_NUMBER, in.readInt());
int numDTokens = in.readInt();