Builder := Object clone
Builder forward := method(
	writeln("<", call message name, ">")
	call message arguments foreach(arg,
		content := self doMessage(arg)
		if (content type == "Sequence", writeln(content))
	)
	writeln("</", call message name, ">")
)

Builder ul(
	li("IO"),
	li("Lua"),
	li("Javascript")
)