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

On 11/18/14 6:10 PM, Ron Savage wrote:
>
>
> Am I correct in thinking the attached (previous email) shows a 
> situation where, to disambiguate, dot (by convention) takes 'one' and 
> 'cluster_four' 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.
>
That's specified by the grammar in the subgraph production. A subgraph 
can have only one of three forms:

  {...}   // totally anonymous
  subgraph { ... }   // still anonymous but with syntactic sugar so it's 
clear it's a subgraph
  subgraph ABC { ... } // named subgraph

so the line
> one { two -> three }
is interpreted as a node whose name is "one", and an anonymous subgraph 
containing the two nodes "two" and "three" and an edge
between them.

     Emden
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