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- graph = [ T_strict ] ( T_graph | T_digraph ) [ ID ] '{' stmt_list '}'
- stmt_list = [ stmt [ ';' ] stmt_list ]
- stmt = node_stmt | edge_stmt | attr_stmt | ID '=' ID | subgraph
- attr_stmt = ( T_graph | T_node | T_edge ) attr_list
- attr_list = '[' [ a_list ] ']' [ attr_list ]
- a_list = ID '=' ID [ ( ';' | ',' ) ] [ a_list ]
- edge_stmt = ( node_id | subgraph ) edgeRHS [ attr_list ]
- edgeRHS = edgeop ( node_id | subgraph ) [ edgeRHS ]
- node_stmt = node_id [ attr_list ]
- node_id = ID [ port ]
- port = ':' ID [ ':' compass_pt ] | ':' compass_pt
- subgraph = [ T_subgraph [ ID ] ] '{' stmt_list '}'
- compass_pt = ( T_n | T_ne | T_e | T_se | T_s | T_sw | T_w | T_nw | T_c | T__ )
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