XSL-FO file works for FOP but not for JFOR!!

Hi,
I am working on a project converting XML to PTF, RDF.
I use FOP and JFOR to do that. The XML-FO
 file i produce by Xalan works for FOP perfectly,
 but not for JFOR.

I used the following versions for xalan and xerces.

xalan200.jar  xerces220.jar

would you give any suggestions for this problem?
I greatly appreciate your help in advance,

b.



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