Reference Guide

Hi all,

I'm writing Reference Manual pages and I have some questions about...

create rule:

The man page says ...

"The current rule system implementation is very brittle and
is unstable. Users are discouraged from using rules at
this time."

My question are:
Is this command a PostgreSQL deprecated feature ?
Sould I skip it ?
Does it works ?

declare:

DECLARE cursor [ BINARY ]
FOR SELECT expression

The man page says ...

"BINARY cursors give you back the data in the native binary
representation. Thus, binary cursors will tend to be a
little faster since there's less overhead of conversion."

My question is:
I can't see any difference between BINARY and normal cursors.
Does it works ?

Thanks, Jose'