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Go google "Minecraft data values" if you have a player file open. Expand "Inventory", and expand any of the "4 entries" folders.
Count = amount of whatever item.
Slot = where it is in inventory, whether it be on your hotbar, character(armor), bagspace or crafting space.
Damage = I'm assuming durability lost/left from tools. Not quite sure which one.
id = This is where the data values come in. Whatever number it is matches up with the Dec value on the Minepedia website.
I did that, and there's only one map. I decided to go to it. I spawned, but could only look around. Couldn't walk, got a couple different errors in console. Plus, there's only one map in the "maps" folder. I'll try running it in gmod or something.