Some thoughts on this:
-Using XSD instead of DTD makes actual useful validation of XML data a realistic possibility. You can have types, enumeration, ranges, and other matching mechanisms to make sure the config file's values are viable before you get into any detail.
-No config mechanism can do full input checking without being a quite specific language (how should it pre-validate an email address or url? just try it? that's ridiculous). The best you can do is hope that it eliminates most of the cruft up front.
-For user editable data, wasn't YAML supposed to do that?
ymmv, of course... :)
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