Datsets in libraries

hi,

I need to rewrite datasets in runtime, building ScriptedDatasets changing xml datasource and datsets to ScriptDatasource and ScriptedDatsets.
If I have the definition of the datasets in a library, it not runs.
I need to have the datasets copied in the model.
Someone knows how i can have the datasets in libraries and rebuild them ?

I`m working with BIRT 2.3.2.

Thanks in advance.