Hi Jörg

> Look at the converter tutorial. The last example at the end will do this
> also.

Oh, I must have missed that one. That seems to indeed do exactly what I wanted.

> Since I assume, that your type containing the Optional is currently handled
> by one of XStream's reflection-based converters, you may use following non-
> obvious approach by wrapping the ReflectionProvider:

Works like a charm!

> I also assume that this is Java to XML only i.e. no deserialization, because
> those fields containing Optionals referencing null will no longer be
> initialized.

Understood. I'm falling back on readResolve for filling in the gaps.

Thanks a lot for your help!
Remko

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