[graphviz-interest] Graph header syntax

Hi there,


When opening (with dotty.exe in versions 2.28, same with 2.30) a file
containing the following:
****************************
digraph  {
0 -> 1;
}
****************************
I get a "dotty;lefty: cannot laod graph" error message.


If I add a name to my dummy graph, viz.:
****************************
digraph G {
0 -> 1;
}
****************************
Everything works just fine.


The page describing the syntax
(http://www.graphviz.org/doc/info/lang.html) contains the following:
* graph : [ strict ] (graph | digraph) [ ID ] '{' stmt_list '}'
Which indicates that the string after "digraph" should be optional.

However, current implementation is not conform.


The same symptom occurs with the "subgraph" construct:
* subgraph : [ subgraph [ ID ] ] '{' stmt_list '}'

A missing "ID" causes a parse error (but a missing "subgraph ID" works fine).


So, is it a problem in the doc or in the implementation?

Thanks in advance.

Sarkis
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