Need help Combining two XML files to a single WordML file

Hi
I have an xml file e.g Data.xml which contains raw data e.g. <Name>Mark</Name>
<Address>New York</Address>
and another xml file containing the formatting factors or attributes of Data.xml e.g Format.xml
<Name>
<font>Arial</font>
</size>12</size>
</Name>
So i now i want to combine or apply these formatting factors to my raw data or inshort relate the 2 files format.xml and data.xml to give an output in WordML file.
So please guide me how do i go about doing or developing this?
Thanks