How to store MetaData that descibes IOObject

Hello,
I have a problem with storing my own metadata which describes image. What should I do, to store these metadata.
In SimpleIOObjectEntry class is method for storing:

public void storeData(IOObject data, Operator callingOperator, ProgressListener l) throws RepositoryException {
		if (l != null) {
			l.setTotal(100);
			l.setCompleted(10);
		}
		MetaData md = MetaData.forIOObject(data);
		// Serialize Non-ExampleSets as IOO
		OutputStream out = null;
...
...

And it calls:

 public static MetaData forIOObject(IOObject ioo, boolean shortened) {
        MetaData result;
        if (ioo instanceof ExampleSet) {
            result = new ExampleSetMetaData((ExampleSet)ioo, shortened);
        } else {
            result = new MetaData(ioo.getClass());
        }
        result.annotations = new Annotations(ioo.getAnnotations());
        return result;
    }

This creates new MD with no reference to IOObject, so fields have default values. Can you change it to:

 public static MetaData forIOObject(IOObject ioo, boolean shortened) {
        MetaData result;
        if (ioo instanceof ExampleSet) {
            result = new ExampleSetMetaData((ExampleSet)ioo, shortened);
        } else {
            result = new MetaData(ioo);
        }
        result.annotations = new Annotations(ioo.getAnnotations());
        return result;
    }

Now I realized, that it won't help.

Or is there another solution?

Thank you in advance for your reply.

Best,
Vaclav