[vtkusers] how can I instance a dynamic object like vtkPolydataReader

[Jaufre Devosse]

I've made a xml file and include inside a data
object(vtkPolydata). How can I instance a object
vtkPolydataReader dynamicaly from a string which is
the name of the good reader.

example : 
<root>
  <vtkPolyDataReader>
    <data compressed="yes" taille="3920">
     .....all data for creating an object...
    </data
  </vtkPolyDataReader>
</root>

I catch the name of the tag "vtkPolyDataReader". SO,
how can I instance an object vtkPolyDataReader.
I've try
vtkObjectFactory::createInstance("vtkPolyDataReader")
but it seems to fail??

thank for helping me
Jaufre

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