This idea is by James (ign: MinecraftM3rcy) and is to be credited to him.
Twitter: @MayorOwel

This is the outline to a code that the map maker might use in order to control a mob arena.
This specific mob arena would allow for a leveling system according to how many skeletons thet player had killed.
This code would be written in this easier format, then sent through a program that converts this type of code into the commandblock language, arranges the command blocks to a 20Hz clock, and exports the schematic.

List of variables used in this example:
title - This would be the name of the schematic exported
user - This would be the closest person
# # # - These are locations, in the order of XYZ
set - This sets the scoreboard number, the creator must make the scoreboard
if - Uses a scoreboard <user> test command to see if a user has done specific things
clear - Clears specific things from the users inventory, if "inventory" is set then it will clear all
spawn - Spawns the specified mob, the specific amount of times
teleport - Teleports the user to a specific location
heal - Heals specified player, or user
repair - Repairs specified items, use "armor" for all armor or "tools" for all tools (including swords)
add user to - This adds the user to a scoreboard objective or team


title MyCommandBlockSchematic

if user at 20 20 20 -- If user is at a specific location, perform the following, this loops the entire time they are in the arena

	set skeletonsKilled = 0

	if skeletonsKilled == 0 -- If the user is at the location and has killed no skeletons, do this
		set level = 1 -- Updates the users level with scoreboard
		clear inventory -- Clears the inventory so that the user cant cheat
		give user iron sword -- Give the user their sword
		spawn 5 skeleton -- Spawns five skeletons inside the arena

	if skeletonsKilled == 5
		set level = 2
		give user diamond chestplate
		spawn 10 skeleton

	if skeletonsKilled == 15
		set level = 3
		give user diamond pants
		spawn 15 skeleton

	if skeletonsKilled == 30
		set level = 4
		give user diamond boots
		spawn 20 skeleton

	if skeletonsKilled == 50
		set level = 5
		give user diamond helmet
		spawn 25 skeleton

	if skeletonsKilled == 75
		give user diamond sword { enchants: knockback5, fireaspect1 }
		teleport user 10 10 10
		heal user
		repair user armor

if user at 10 10 10 -- Checks to see if the user has been teleported to the winner location
	
	if user wins > 0 -- Tests to see if the user has won before
		set wins = wins + 1 --Increases how many times the user has won
		teleport user to spawn -- Teleports the user to spawn so that they don't get indinite wins

	if user wins == 0 --Tests to see if this is the first time the user won
		add user to winList -- Adds the user to the winners list
		set wins = wins + 1 -- Increases how many times the user has won
		teleport user to spawn -- Teleports the user to spawn so that they don't get infinite wins