`validate` accepts un-paired tags

[ocramz]

λ> isRight $ Text.XML.Hexml.parse "<b>"
False
λ> Xeno.SAX.validate "<b>"
True

[chrisdone]

That's a SAX parser, so it doesn't look at hierarchy, it only validates lexical correctness.

<b> is valid, but e.g. <b would not validate.

Try the DOM module.

[qrilka]

So I guess it's worth a note in haddocks