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Now I bet you are wondering what Spleef is so I have a link for you! http://www.minecraftwiki.net/wiki/Spleef
The .schematic file format was created by users to store sections of a Minecraft world for use with third-party programs (specifically, MCEdit, Minecraft Song Planner, Redstone Simulator, and WorldEdit). Schematics are in NBT format and are loosely based on the Indev level format.
Please see the individual application above for usage instructions.