SET TRANSACTION --+---------------+->
                    +-> tx-options -+
                    +-> db-txns ----+

  tx-options =

  --+-+----------------------------------------+-+->
    | +-> NAME 'quoted-string' ----------------+ |
    | +-> EVALUATING -+- evaluating-clause --+-+ |
    | |               +-------> , <----------+ | |
    | +-> RESERVING --+-> reserving-clause --+-+ |
    | |               +-------- , <----------+ | |
    | +-> isolation-level ---------------------+ |
    | +-> transaction-mode --------------------+ |
    | +-> wait-option -------------------------+ |
    +----------------+-------+-------------------+
                     +-- , <-+

  transaction-mode =

  --+-> READ ONLY ----+->
    +-> READ WRITE ---+
    +-> BATCH UPDATE -+

  wait-option =
  --+-> WAIT -+---------------------+-+->
    |         +-> <timeout-value> --+ |
    +-> NOWAIT -----------------------+

  isolation-level =

  ---> ISOLATION LEVEL --+-> READ COMMITTED ----+-->
                         +-> REPEATABLE READ ---+
                         +-> SERIALIZABLE ------+

  evaluating-clause =

  -+-------------+-> <constraint-name> -> AT -+-> VERB TIME ---+-->
   +-> <alias.> -+                            +-> COMMIT TIME -+

  reserving-clause =

  -+-+-> <view-name> ------------------------------------------------+-+-+
   | +-> <table-name> -+-------------------------------------------+-+ | |
   |                   +-> PARTITION --> ( -+-> <part-num> -+-> ) -+   | |
   |                                        +------ , <-----+          | |
   +----------------------------------- , <----------------------------+ |
   +---------------------------------------------------------------------+
   +-> FOR -+--------------+--+-> READ ------------+--------------------->
            +-> EXCLUSIVE -+  +-> WRITE -----------+
            +-> PROTECTED -+  +-> DATA DEFINITION -+
            +-> SHARED ----+

  db-txns =

  --+--------------------------------------------------------------+-->
    ++-> ON -+-> <alias> -+-> USING --> ( +-> tx-options --+-> ) -++
     |       +---- , <----+               +-> DEFAULTS ----+      |
     +-------------------------- AND <----------------------------+