I've caused my own problems like that when I accidently (OK, carelessly) deleted part of a closing tag in a doc I got that had [CDATA] section since the tagging style was not what I was expecting
http://www.w3schools.com/xml/xml_cdata.asp
Quote:
Everything inside a CDATA section is ignored by the parser.
A CDATA section starts with "<![CDATA[" and ends with "]]>":
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Paul