Re: Inaccurate documentation about identifiers

On 11/17/22 23:47, raf wrote:
> On Thu, Nov 17, 2022 at 03:01:10PM -0500, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
>> ident_start [A-Za-z\200-\377_]
>> ident_cont [A-Za-z\200-\377_0-9\$]
>>
>> identifier {ident_start}{ident_cont}*
>
> Does the SQL spec require accepting *only* real letters as letters,
> or does it require accepting *at least* real letters as letters. :-)
> Just a bit of wishful thinking.

<identifier body> ::=
<identifier start> [ <identifier part>... ]

<identifier part> ::=
<identifier start>
| <identifier extend>

An <identifier start> is any character in the Unicode General Category
classes “Lu”, “Ll”, “Lt”, “Lm”, “Lo”, or “Nl”.

An <identifier extend> is U+00B7, “Middle Dot”, or any character in the
Unicode General Category classes “Mn”, “Mc”, “Nd”, or “Pc”.
--
Vik Fearing