process fast infoset in C++?

Hi!

I am fairly new to xml processing and hope you can help me to dispel the darkness. 
I am wondering if there is an open source solution for processing fast infoset documents in C++. If not, do you think it is hard to extend already existing xml processors like xerces-c, expat or libxml to handle fast infoset documents?

Cheers,
Ronny
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