[graphviz-interest] Is DOT syntax ambiguous re node names and subgraph names?

Hi

See attached.

Am I correct in thinking the attached shows a situation where, to 
disambiguate, dot (by convention) takes 'two' and 'cluster_five' as node 
names rather than subgraph names?

Is the decision documented somewhere? I couldn't see it on 
http://www.graphviz.org/content/dot-language.

-- 
Ron Savage - savage.net.au

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digraph graph_29_01
{
	# 'one' is a node name, not a subgraph name.

	one { two -> three }

	# 'cluster_four' is a node name, not a subgraph name.

	cluster_four { five -> six }

	# 'cluster_seven' is a subgraph name, not a node name.

	subgraph cluster_seven { label = "\G" eight -> nine }
}