legend.dot

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	label="Legend"
	key [label=<<table border="0" cellpadding="2" cellspacing="0" cellborder="0">
		<tr><td align="right" port="i1">testbed for</td></tr>
		<tr><td align="right" port="i2">library/component used by</td></tr>
		<tr><td align="right" port="i3">GUI for</td></tr>
		<tr><td align="right" port="i4">other dependency</td></tr>
		</table>>]
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		<tr><td port="i1">&nbsp;</td></tr>
		<tr><td port="i2">&nbsp;</td></tr>
		<tr><td port="i3">&nbsp;</td></tr>
		<tr><td port="i4">&nbsp;</td></tr>
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	key:i4:e -> key2:i4:w [color=green]
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