I receive the following error in NGDBuild:
ERROR:NgdBuild:189 - On or above line 2 in file "top.edf": Only EDIF Version 2.0.0 is supported! This likely means that the EDIF netlist was improperly written. Please contact the vendor of the program that produced this EDIF.
This is an issue when using Synplify Value Pack while targeting Spartan-3 family for Synthesis and Implementation using the old ISE tools. This is no longer an issue in ISE 9.1sp2.