digraph UML_Class_diagram {
	graph [
		label="UML Class diagram demo"
		labelloc="t"
		fontname="Helvetica,Arial,sans-serif"
	]
	node [
		fontname="Helvetica,Arial,sans-serif"
		shape=record
		style=filled
		fillcolor=gray95
	]
	edge [fontname="Helvetica,Arial,sans-serif"]
	edge [arrowhead=vee style=dashed]
	Client -> Interface1 [label=dependency]
	Client -> Interface2

	edge [dir=back arrowtail=empty style=""]
	Interface1 -> Class1 [xlabel=inheritance]
	Interface2 -> Class1 [dir=none]
	Interface2 [label="" xlabel="Simple\ninterface" shape=circle]

	Interface1[label = <{<b>«interface» I/O</b> | + property<br align="left"/>...<br align="left"/>|+ method<br align="left"/>...<br align="left"/>}>]
	Class1[label = <{<b>I/O class</b> | + property<br align="left"/>...<br align="left"/>|+ method<br align="left"/>...<br align="left"/>}>]
	edge [dir=back arrowtail=empty style=dashed]
	Class1 -> System_1 [label=implementation]
	System_1 [
		shape=plain
		label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="4">
			<tr> <td> <b>System</b> </td> </tr>
			<tr> <td>
				<table border="0" cellborder="0" cellspacing="0" >
					<tr> <td align="left" >+ property</td> </tr>
					<tr> <td port="ss1" align="left" >- Subsystem 1</td> </tr>
					<tr> <td port="ss2" align="left" >- Subsystem 2</td> </tr>
					<tr> <td port="ss3" align="left" >- Subsystem 3</td> </tr>
					<tr> <td align="left">...</td> </tr>
				</table>
			</td> </tr>
			<tr> <td align="left">+ method<br/>...<br align="left"/></td> </tr>
		</table>>
	]

	edge [dir=back arrowtail=diamond]
	System_1:ss1 -> Subsystem_1 [xlabel="composition"]

	Subsystem_1 [
		shape=plain
		label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="4">
			<tr> <td> <b>Subsystem 1</b> </td> </tr>
			<tr> <td>
				<table border="0" cellborder="0" cellspacing="0" >
					<tr> <td align="left">+ property</td> </tr>
					<tr> <td align="left" port="r1">- resource</td> </tr>
					<tr> <td align="left">...</td> </tr>
				</table>
				</td> </tr>
			<tr> <td align="left">
				+ method<br/>
				...<br align="left"/>
			</td> </tr>
		</table>>
	]
	Subsystem_2 [
		shape=plain
		label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="4">
			<tr> <td> <b>Subsystem 2</b> </td> </tr>
			<tr> <td>
				<table align="left" border="0" cellborder="0" cellspacing="0" >
					<tr> <td align="left">+ property</td> </tr>
					<tr> <td align="left" port="r1">- resource</td> </tr>
					<tr> <td align="left">...</td> </tr>
				</table>
				</td> </tr>
			<tr> <td align="left">
				+ method<br/>
				...<br align="left"/>
			</td> </tr>
		</table>>
	]
	Subsystem_3 [
		shape=plain
		label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="4">
			<tr> <td> <b>Subsystem 3</b> </td> </tr>
			<tr> <td>
				<table border="0" cellborder="0" cellspacing="0" >
					<tr> <td align="left">+ property</td> </tr>
					<tr> <td align="left" port="r1">- resource</td> </tr>
					<tr> <td align="left">...</td> </tr>
				</table>
				</td> </tr>
			<tr> <td align="left">
				+ method<br/>
				...<br align="left"/>
			</td> </tr>
		</table>>
	]
	System_1:ss2 -> Subsystem_2;
	System_1:ss3 -> Subsystem_3;

	edge [xdir=back arrowtail=odiamond]
	Subsystem_1:r1 -> "Shared resource" [label=aggregation]
	Subsystem_2:r1 -> "Shared resource"
	Subsystem_3:r1 -> "Shared resource"
	"Shared resource" [
		label = <{
			<b>Shared resource</b>
			|
				+ property<br align="left"/>
				...<br align="left"/>
			|
				+ method<br align="left"/>
				...<br align="left"/>
			}>
	]
}