statements. Attributes: {}
    |--- :default. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":default"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- action. Attributes: {bracketed_name => "0", quantifier => "", real_name => "action"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- [values]. Attributes: {bracketed_name => "0", quantifier => "", real_name => "[values]"}
    |--- :start. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":start"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- graph_grammar. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_grammar"}
    |--- graph_grammar. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_grammar"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- graph_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_definition"}
    |    |--- action. Attributes: {bracketed_name => "0", quantifier => "", real_name => "action"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- graph. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph"}
    |--- graph_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_definition"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- node_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_definition"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- edge_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_definition"}
    |--- node_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_definition"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- node_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_statement"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- node_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_statement"}
    |    |--- graph_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_definition"}
    |--- node_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_statement"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- node_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_name"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- node_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_name"}
    |    |--- attribute_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "attribute_definition"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- node_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_statement"}
    |    |--- (','). Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |    |--- node_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_statement"}
    |--- node_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "node_name"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- start_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_node"}
    |    |--- end_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_node"}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- start_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_node"}
    |    |--- pause. Attributes: {bracketed_name => "0", quantifier => "", real_name => "pause"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- before. Attributes: {bracketed_name => "0", quantifier => "", real_name => "before"}
    |    |--- event. Attributes: {bracketed_name => "0", quantifier => "", real_name => "event"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- start_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_node"}
    |--- start_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_node"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- '['. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- end_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_node"}
    |--- end_node. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_node"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- ']'. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- edge_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_definition"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- edge_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_statement"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- edge_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_statement"}
    |    |--- graph_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "graph_definition"}
    |--- edge_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_statement"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- edge_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_name"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- edge_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_name"}
    |    |--- attribute_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "attribute_definition"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- edge_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_statement"}
    |    |--- (','). Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |    |--- edge_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_statement"}
    |--- edge_name. Attributes: {bracketed_name => "0", quantifier => "", real_name => "edge_name"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- directed_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "directed_edge"}
    |    |--- |. Attributes: {bracketed_name => "0", quantifier => "", real_name => "|"}
    |    |--- undirected_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "undirected_edge"}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- directed_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "directed_edge"}
    |    |--- pause. Attributes: {bracketed_name => "0", quantifier => "", real_name => "pause"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- before. Attributes: {bracketed_name => "0", quantifier => "", real_name => "before"}
    |    |--- event. Attributes: {bracketed_name => "0", quantifier => "", real_name => "event"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- directed_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "directed_edge"}
    |--- directed_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "directed_edge"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- '->'. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- undirected_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "undirected_edge"}
    |    |--- pause. Attributes: {bracketed_name => "0", quantifier => "", real_name => "pause"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- before. Attributes: {bracketed_name => "0", quantifier => "", real_name => "before"}
    |    |--- event. Attributes: {bracketed_name => "0", quantifier => "", real_name => "event"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- undirected_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "undirected_edge"}
    |--- undirected_edge. Attributes: {bracketed_name => "0", quantifier => "", real_name => "undirected_edge"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- '--'. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- attribute_definition. Attributes: {bracketed_name => "0", quantifier => "", real_name => "attribute_definition"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- attribute_statement. Attributes: {bracketed_name => "0", quantifier => "*", real_name => "attribute_statement"}
    |--- attribute_statement. Attributes: {bracketed_name => "0", quantifier => "", real_name => "attribute_statement"}
    |    |--- ::=. Attributes: {bracketed_name => "0", quantifier => "", real_name => "::="}
    |    |--- start_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_attributes"}
    |    |--- end_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_attributes"}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- start_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_attributes"}
    |    |--- pause. Attributes: {bracketed_name => "0", quantifier => "", real_name => "pause"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- before. Attributes: {bracketed_name => "0", quantifier => "", real_name => "before"}
    |    |--- event. Attributes: {bracketed_name => "0", quantifier => "", real_name => "event"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- start_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_attributes"}
    |--- start_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "start_attributes"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- '{'. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- :lexeme. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":lexeme"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- end_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_attributes"}
    |--- end_attributes. Attributes: {bracketed_name => "0", quantifier => "", real_name => "end_attributes"}
    |    |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
    |    |--- '}'. Attributes: {bracketed_name => "0", quantifier => "", real_name => ""}
    |--- :discard. Attributes: {bracketed_name => "0", quantifier => "", real_name => ":discard"}
    |    |--- =>. Attributes: {bracketed_name => "0", quantifier => "", real_name => "=>"}
    |    |--- whitespace. Attributes: {bracketed_name => "0", quantifier => "", real_name => "whitespace"}
    |--- whitespace. Attributes: {bracketed_name => "0", quantifier => "", real_name => "whitespace"}
         |--- ~. Attributes: {bracketed_name => "0", quantifier => "", real_name => "~"}
         |--- [\s]. Attributes: {bracketed_name => "0", quantifier => "+", real_name => "[\s]"}