Re: Fix XML handling with DOCTYPE

Ryan Lambert <ryan@rustprooflabs.com> writes:
> I'm investigating the issue I reported here:
> https://www.postgresql.org/message-id/flat/153478795159.1302.9617586466368699403%40wrigleys.postgresql.org
> I'd like to work on a patch to address this issue and make it work as
> advertised.

Good idea, because it doesn't seem like anybody else cares ...

> I see xmlParseBalancedChunkMemoryRecover that might provide the
> functionality needed.

TBH, our experience with libxml has not been so positive that I'd think
adding dependencies on new parts of its API would be a good plan.

Experimenting with different inputs, it seems like removing the
"<!DOCTYPE ...>" tag is enough to make it work.  So what I'm wondering
about is writing something like parse_xml_decl() to skip over that.

Bear in mind though that I know next to zip about XML.  There may be
some good reason why we don't want to strip off the !DOCTYPE part
from what libxml sees.

            regards, tom lane