SGML actually has some really nice properties explicitly designed to better handle parsing invalid files. The redundant close tags, for example, allow <b>this i

SGML actually has some really nice properties explicitly designed to better handle parsing invalid files. The redundant close tags, for example, allow <b>this is bold <i>and italic</b> but not bold</i> -- these sorts of errors are made by people and it was a goal to handle those sorts of situations. Whether or not that was a good goal? Well, I guess that's part of this debate.