db_question_statement: [ question , author , [ answer_item , ] , category_item , [ tag , ] ] db_question_statement ::= '[' question ',' author ',' '[' answer_item ( ',' answer_item )* ']' ',' category_item ',' '[' tag ( ',' tag )* ']' ']' no referencesquestion: " string " question ::= '"' string '"' referenced by: db_question_statement author: " name " author ::= '"' name '"' referenced by: db_question_statement answer_item: " string " , 1 0 answer_item ::= '"' string '"' ',' ( '1' | '0' ) referenced by: db_question_statement category_item: " category " category_item ::= '"' category '"' referenced by: db_question_statement cagetory: [ http://arxiv.org/corr/ ] cagetory ::= [http://arxiv.org/corr/] no referencestag: " string " tag ::= '"' string '"' referenced by: db_question_statement   ... generated by Railroad Diagram Generator R R