digraph g {
	rankdir=LR;

	subgraph cluster_memtree {
		label="in-memory lihata trees"
		bgcolor=grey
		rank=same
		CFR_INTERNAL    [label="CFR_INTERNAL\nultimate fallback"]
		CFR_SYSTEM      [label="CFR_SYSTEM\nsystem level configuration"]
		CFR_DEFAULTPCB  [label="CFR_DEFAULTPCB"]
		CFR_USER        [label="CFR_USER\nuser level configuration"]
		CFR_ENV         [label="CFR_ENV"]
		CFR_PROJECT     [label="CFR_PROJECT\nproject level configuration"]
		CFR_DESIGN      [label="CFR_DESIGN"]
		CFR_CLI         [label="CFR_CLI"]
	}

	subgraph cluster_fields {
		label="string -> conf_native_t hash"
		bgcolor=grey
		conf_fields     [label="conf_fields\ncentral hash\nof all\nknown settings"]
	}

	subgraph cluster_native {
		label="native C structures\nper module"
		bgcolor=grey
		conf_core       [label="conf_core\npcb-rnd core settings"]
		conf_hid_gtk    [label="conf_hid_gtk\nthe hid_gtk plugin's settings"]
		conf_mincut     [label="conf_mincut\nthe mincut plugin's settings"]
		conf_report     [label="conf_report\nthe report plugin's settings"]
		conf_other      [label="...\nother plugin's settings"]
	}

	CFR_INTERNAL    -> conf_fields [color=red]
	CFR_SYSTEM      -> conf_fields [color=red]
	CFR_DEFAULTPCB  -> conf_fields [color=red]
	CFR_USER        -> conf_fields [color=red]
	CFR_ENV         -> conf_fields [color=red]
	CFR_PROJECT     -> conf_fields [color=red]
	CFR_DESIGN      -> conf_fields [color=red]
	CFR_CLI         -> conf_fields [color=red]


#	CFR_INTERNAL    -> CFR_SYSTEM
#	CFR_SYSTEM      -> CFR_DEFAULTPCB
#	CFR_DEFAULTPCB  -> CFR_USER
#	CFR_USER        -> CFR_ENV
#	CFR_ENV         -> CFR_PROJECT
#	CFR_PROJECT     -> CFR_DESIGN
#	CFR_DESIGN      -> CFR_CLI

	conf_fields -> conf_core      [color=red]
	conf_fields -> conf_hid_gtk   [color=red]
	conf_fields -> conf_mincut    [color=red]
	conf_fields -> conf_report    [color=red]
	conf_fields -> conf_other     [color=red]



	subgraph cluster_files {
		label="config files"
		bgcolor=grey
		lht_system        [label="/usr/share/pcb-rnd/conf_core.lht" shape=hexagon]
		pcb_default       [label="default board, e.g.\n/usr/share/pcb-rnd/default4.lht" shape=hexagon]
		project           [label="./project.lht" shape=hexagon]
		lht_user          [label="~/.pcb-rnd/conf_core.lht" shape=hexagon]
	}

	subgraph cluster_exec_env {
		label="execution environment"
		bgcolor=grey
		env               [label="environmental variables"]
		cli               [label="command line arguments\ne.g. -c or\npluginspecific args"]
	}

	lht_internal      [label="hardwired\nin the\nexecutable"]
	design            [label="settings\nin the\nboard file\n(.lht and .pcb)" shape=hexagon]

	lht_internal -> CFR_INTERNAL    [label="program startup"]
	lht_system   -> CFR_SYSTEM      [label="loaded at startup"]
	pcb_default  -> CFR_DEFAULTPCB  [label="loadad in CreateNewPCB()"]
	lht_user     -> CFR_USER        [label="loaded at startup" dir=both]
	env          -> CFR_ENV         [label="built at startup"]
	project      -> CFR_PROJECT     [label="loaded when a\nnew board or project\nis loaded" dir=both]
	design       -> CFR_DESIGN      [label="extracted when loading a design" dir=both]
	cli          -> CFR_CLI         [label="built during\ncommand line argument\nparsing"]


	hid_gtk [label="the preferences dialog"]

	conf_core     -> hid_gtk [weight=100]
	conf_hid_gtk  -> hid_gtk

	hid_gtk -> CFR_DESIGN  [color=blue weigth=0]
	hid_gtk -> CFR_PROJECT [color=blue weigth=0 style=dashed]
	hid_gtk -> CFR_USER    [color=blue weigth=0 style=dashed]


	editor  [label="core:\nediting pcb"]
	conf_core -> editor   [weight=100]
	editor -> CFR_DESIGN  [color=blue weigth=0]

}