C++ xslt fo engine

I noticed that the performance of Xalan C++ version is
much better than that of Xalan Java version.  I may be
too hasty to conclude that all C++ editions of XSLT
engine perform better than Java editions in most
cases.
Thus, I'd like to look for a C++ version of XSLT FO
engine for my project.  Currently available for me are
Apache FOP, and XEP.  Unfortunately, both are written
in Java.  I wonder if any one used an XSLT FO engine
written in C++ or C?

Thanks so much.

Yan



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