The following steps can be used to incorporate an XNF file into a schematic.

1. Assume that you are working on a project name foo
   Create an xnf file, say pak.xnf.

    LCANET,5
    PROG,
    PART,
    SYM,Z0,OR,SCHNM=OR2,LIBVER=2.0.0
     PIN,O,O,Z0
     PIN,I0,I,X8
     PIN,I1,I,X3
    END
    EXT,Z0,O,,
    EXT,X8,I,,
    EXT,X3,I,,
    EOF
   

   
   Be sure the xnf file is deposited in your active\projects\foo subdirectory.
2. Go to Foundation Schematic Editor (drawing tool). choose Hierarchy->Create Macro Symbol from Netlist..
   In the Import Netlist window that appears, select the Xilinx .XNF format
   Grab the file pak.xnf
   Watch that the schematic tool will create a MACRO symbol for this XNF file in your component library. Grab the MACRO, place it on the drawing sheet, add the buffers, pads, and there you have it: