item_declaration ::=
   { collection_declaration
   | constant_declaration
   | cursor_declaration
   | cursor_variable_declaration
   | exception_declaration
   | object_declaration
   | object_ref_declaration
   | record_declaration
   | variable_declaration
   }

sql_statement ::=
   { commit_statement
   | delete_statement
   | insert_statement
   | lock_table_statement
   | rollback_statement
   | savepoint_statement
   | select_statement
   | set_transaction_statement
   | update_statement
   }