xml.toString(): Cow
xml.toString(): <animals><animal id="1">Cow</animal><animal id="2">Pig</animal></animals>
xml.toString(): <foo><bar a="x" b="y" c="z"/></foo>
xml.toString(): <foo><bar x="a&quot;b">&gt;&amp;&lt;</bar></foo>
xml.toString(): <!-- some comment -->
xml.toString(): <? processing instruction! ?>
