anchor.diff:     ;
   
   plsql_opt_transaction_chain
  -   : AND CHAIN
  -   | AND NO CHAIN
  +   : AND (CHAIN | NO CHAIN)
      |
      ;
   
   stmt_set
      : SET any_name TO DEFAULT SEMI
  -   | RESET any_name SEMI
  -   | RESET ALL SEMI
  +   | RESET (any_name | ALL) SEMI
      ;
   
   cursor_variable
  
positive.code:    ;
  
  decl_sect
     : opt_block_label
     | opt_block_label decl_start
     | opt_block_label decl_start decl_stmts
     ;
  
  decl_start
  
negative.code:    ;
  
  window_definition_list
     : window_definition (COMMA window_definition)*
     ;
  
  window_definition
  