9. A method as described in claim 8 wherein said performing a data transformation comprises automatically transforming said data change into a transformation script of a transformation language for implementation by said join engine peer.
9. A method as described in claim 8 wherein said performing a data transformation comprises automatically transforming said data change into a transformation script of a transformation language for implementation by said join engine peer. 10. A method as described in claim 9 wherein said transformation language is compliant with XSLT syntax.