On 09.01.23 21:18, Tom Lane wrote:
> * AFAIK our practice is to use "-" never "_" in XML ID attributes.
> You weren't very consistent about that even within this patch, and
> the overall effect would have been to have no standard about that
> at all, which doesn't seem great. I changed them all to "-".
In the olden says, "_" was invalid in ID attribute values. This is no
longer the case. But of course it's good to stay consistent with
existing practice where reasonable.