<book>
...
<!-- Illegal start tag with no attributes followed by illegal end tag. -->
<badtag>text inside bad tags</badtag>
...
<!-- Illegal tag with attributes (both literal and non-literal strings) -->
<illegal size=20 buyers="My Company.Inc" level=high>
...
<!-- Illegal end tag; all by itself -->
</defunct>
</book>
...
<!-- Illegal start/end tag pair AFTER end-of- instance tag -->
<naughty></naughty>