digraph {
//	rankdir=LR
	center=1
//	ordering=out

	// sources
	rank=same {app1 app2 app3}
	app1 [label="Some cool language application"]
	app2 [label="Mozilla Firefox"]
	app3 [label="OpenOffice.org"]

	// dist
	rank=same {deb}
	deb [shape="circle", label="Debian"]

	// shared derivations
//	rank=same {deb_edu deb_med deb_ezgo deb_blankon ub}
	rank=same {deb_edu deb_ezgo ub}
	deb_edu [label="Debian-edu"]
//	deb_med [label="Debian-med"]
	deb_ezgo [label="Debian-EzGO"]
//	deb_blankon [label="Debian-blankon\n(graphics + menu structure"]
	ub [shape="circle", label="Ubuntu"]

	// distro-specific customizations
//	rank=same {skolelinux_config ezgo_graphics ezgo_locale ezgo_struct blankon_hw blankon_doc blankon_graphics}
	rank=same {ezgo_graphics ezgo_locale ezgo_struct}
	skolelinux_cfg [label="configuration", style="invis"]
	ezgo_graphics [label="graphics", style="invis"]
	ezgo_locale [label="translation", style="invis"]
	ezgo_struct [label="menu structure", style="invis"]
	ezgo_content [label="open content"]
/*	blankon_hw [label="hardware support", style="invis"]
	blankon_doc [label="documentation", style="invis"]
	blankon_graphics [label="graphics", style="invis"]
	blankon_locale [label="translation", style="invis"]
	blankon_struct [label="menu structure", style="invis"]
*/
	// derivatives of blends/derivatives
//	rank=same {skolelinux ezgo blankon emate}
	rank=same {skolelinux ezgo emate}
//	blankon [shape="circle", label="BlankOn"]
	skolelinux [shape="circle", label="Skolelinux"]
	ezgo [shape="circle", label="EZGo"]
	emate [shape="circle", label="E-mate"]

	// chains
	app1 -> deb [dir="both"]
	app2 -> deb [dir="both"]
	app3 -> deb [dir="both"]
	deb -> deb_edu [dir="both", style="bold"]
//	deb -> deb_med [dir="both", style="bold"]
	deb -> deb_ezgo [dir="both", style="bold"]
//	deb -> deb_blankon [dir="both", style="bold"]
	deb -> ub

	skolelinux_cfg -> skolelinux [style="invis"]
	deb_edu -> skolelinux
	ezgo_content -> skolelinux

	ub -> ezgo_graphics [style="invis"]
	ub -> ezgo [style="invis"]
	deb_edu -> ezgo
	deb_ezgo -> ezgo
	ezgo_graphics -> ezgo [style="invis"]
	ezgo_locale -> ezgo [style="invis"]
	ezgo_struct -> ezgo [style="invis"]
	ezgo_content -> ezgo

/*	ub -> blankon [style="invis"]
	deb_ezgo -> blankon
	deb_blankon -> blankon
	blankon_doc -> blankon [style="invis"]
	blankon_hw -> blankon [style="invis"]
	blankon_graphics -> blankon [style="invis"]
	blankon_locale -> blankon [style="invis"]
	blankon_struct -> blankon [style="invis"]
*/
	deb_edu -> emate
//	deb_med -> emate
	deb_ezgo -> emate
	ezgo_content -> emate
//	deb_blankon -> emate
}