ight seem surprising given that the SPI functions mostly
  have documented error-return conventions.  Those conventions only apply
  for errors detected within the SPI functions themselves, however.)
  It is possible to recover control after an error by establishing your own
  subtransaction surrounding SPI calls that might fail.  This is not currently
  documented because the mechanisms required are still in flux.
 </P
><P
>  <ACRONYM
CLASS="ACRONYM"
>SPI</ACRONYM
> functions return a nonnegative result on