digraph PHPCore{
	concentrate = true;
	compound = true;

	subgraph cluster0 {
		label = "PHP";
		style = filled;
		color = cyan;
		Internals -> QA [dir = both];
		Internals -> Extensions [dir = both];
		QA -> Extensions [dir = both];
		Internals -> "PHP Documentation" [dir = both];
		QA -> "PHP Documentation" [dir = both];
		Extensions -> "PHP Documentation" [dir = both];
		"PHP Documentation" [shape=box];
	}

	PEAR -> Internals [lhead=cluster0,minlen=2];
	Programmers -> Extensions [lhead=cluster0,minlen=1];
	Advocates -> QA [lhead=cluster0,minlen=1];
	"End users" -> "PHP Documentation" [lhead=cluster0,minlen=1];
}