Hi Martin,
thanks for your quick answer. I didn't know that '.' could be missleading.
Is there any standard way to name function for S4 objects? "get","set"
etc..?

I saw your example, and I was wondering, why get.par(ext) put out "Son1",
and not the same as get.par(new("Son1", name="Son1", par=3))

If I define a function just like setMethod("get.par", "Father",
function(object) object@name) , for example

setMethod("get.par", "Father", function(object) object@par) 

then it would work, for all objects, which are either Son1 or Son2, but not
all object, which are "Father", contains also the variable par

 get.par(new("Father"))

Alexander



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