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XSL-FO Documents

XSL-FO documents are XML files with output information. XSL-FO documents are XML files with output information. They contain information about the output layout and output contents. XSL-FO documents are stored in files with a *.fo or a *.fob extension. It is also quite normal to see XSL-FO documents stored with the *.xml extension, because this makes them more accessible to XML editors.

http://www.w3schools.com/xslfo/xslfo_documents.asp