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From: Takahiro Itagaki on 15 Feb 2010 04:27

Tom Lane <tgl(a)sss.pgh.pa.us> wrote:

> itagaki(a)postgresql.org (Takahiro Itagaki) writes:
> This syntax synopsis is completely nuts:
> DO { [ LANGUAGE lang_name ] | code } ...
>
> I think that it would be logically correct without the square brackets,

Oops, that's correct.

> but as a matter of clarity I really doubt it's an improvement over the
> original.

We cannot write down the accurate syntax with BNF, right? We can have
0..1 "LANGUAGE lang_name", but must have just 1 "code" in any order.

How about the following description?

DO [ LANGUAGE lang_name ] code

because the psql tab completion adds LANGUAGE just after DO.

Regards,
---
Takahiro Itagaki
NTT Open Source Software Center



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