[graphviz-interest] Edge statements in Dot

The definition of the Dot language on the Graphviz website says:

edge_stmt : (node_id | subgraph) edgeRHS [ attr_list ]
edgeRHS : edgeop (node_id | subgraph) [ edgeRHS ]
subgraph : [ subgraph [ ID ] ] '{' stmt_list '}'

My understanding of this is that it's possible to state edges between
multiple nodes using braces, such as: `{a b} -> {c d}` being
equivalent to `a -> c; a -> d; b -> c; b -> d`.

However, it seems that dot, etc. don't actually require the braces and
happily accept `a, b -> c, d` (but *not* `a b -> c d`).  Is this
intentional (in which case should the language specification be
updated) or a bug?

-- 
Ivan Lazar Miljenovic
[email protected]
http://IvanMiljenovic.wordpress.com
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