I wrote:
> Yeah, it seems like we have now made this behavior official enough that
> it's time to document it better. My thought is to create a new subsection
> in the FE/BE Protocol chapter that explains how multi-statement Query
> messages are handled, and then to link to that from appropriate places
> elsewhere. If anyone thinks the reference section would be better put
> somewhere else than Protocol, please say where.
I've pushed up an attempt at this:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=b976499480bdbab6d69a11e47991febe53865adc
Feel free to suggest improvements.
regards, tom lane