Distinct advantages:
-clear distinction between key and value
-primary literals for:
	numbers,
	dates (with zone),
	durations,
	strings (with encoding),
	arrays,
	ordered hashes
-possibility to create arbitrary literals
-simple references to other keys
-configuration description file - to enable automated checking and interfacing


example description file:
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username:
	type: String(UTF8)
	valid:
		between: 1, 50
		matches: /foo/
	invalid:
		matches: /bar/
connections/*/server:
	type: String(ASCII)
connections/*/port:
	type: Integer
	valid:
		between: 0, 65535
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another example description file, notice that you can have multiple, they are just merged:
----------------------------------------------------------------------------------------------------
username:
	description:
		en: "A description in english of what this field is"
connections/*/server:
	description:
		en: "A description in english of what this field is"
connections/*/port:
	description:
		en: "A description in english of what this field is"
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example config file:
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username: "foobar"
connections \
	main \
		server:   "irc.freenode.org"
		port:     5000
		nickname: $username

		channels \
			#butler \
				password: none
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