Yaroslav Kavenchuk wrote: > It is possible? > And not for new classes - for classes from other libraries? It's possible, but complicated to explain. You need to define a custom "Type" object. Look at the getTypeFor(Class) method in kawa.standard.Scheme. That won't tell you what do do, but it will point you to examples. -- --Per Bothner per@bothner.com http://per.bothner.com/