Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/bugs/baars-bug.xml

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<!DOCTYPE descriptions [

<!ELEMENT descriptions (item,description)? >
<!ELEMENT item (#PCDATA)>
<!ELEMENT description (#PCDATA)>
]>

<descriptions>
  <item>cow</item><description>animal</description>
  <item>farmer</item><description>human</description>
</descriptions>

<!--
The generated code for Descriptions and Descriptions_. 
The instance for Descriptions_ makes no sense to me.

newtype Descriptions = Descriptions [Descriptions_] 
data Descriptions_ = Descriptions_ Item Description


instance XmlContent Descriptions where
    fromElem (CElem (Elem "descriptions" [] c0):rest) =
	(\(a,ca)->
	   (Just (Descriptions a), rest))
	(many fromElem c0)
    fromElem (CMisc _:rest) = fromElem rest
    fromElem rest = (Nothing, rest)
    toElem (Descriptions a) =
	[CElem (Elem "descriptions" [] (concatMap toElem a))]
instance XmlContent Descriptions_ where
    fromElem (CElem (Elem "descriptions" [] c0):rest) =
	(\(a,ca)->
	   (\(b,cb)->
	      (Just (Descriptions_ a b), rest))
	   (definite fromElem "<description>" "descriptions" ca))
	(definite fromElem "<item>" "descriptions" c0)
    fromElem (CMisc _:rest) = fromElem rest
    fromElem rest = (Nothing, rest)
    toElem (Descriptions_ a b) =
	[CElem (Elem "descriptions" [] (toElem a ++ toElem b))]
-->

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