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While creating a DateConverter I've been surprised that it wasn't possible to use that on an attribute. I've had to implement a SingleValueConverter.
Regarding the sourcecode it's only that one which can be used to convert attributes.
I've also read the docs and I haven't found that information. But I think it would be helpful for others.
It's explicitly mentioned:
http://xstream.codehaus.org/alias-tutorial.html#attributes
However, I'll add a note to the converter tutorial also for the next release.