dxml 7.5k LOC std.xml 3k LOCdxml would make the situation a lot worse.
How could it possibly make the situation any worse than it is now? Atm, nobody will ever use std.xml, because it is sub-standard and has no future.
As others have already mentioned: a DTD parser can still be added at a later point. It's like not moving into newly built house, because the winter garden is not yet finished (and you live in Florida :)
