You use CDATA to tell an XML aware parser to ignore something (where "ignore" can either be interpreted by the parser as "don't process, but leave it in" or "completely remove", depending on implementation).this isn't strictly true really. CDATA in XML is actually slightly more complex than that.
Drat...sorry, got myself tangled up and confused. Was thinking of comments <!-- --> within CDATA, which can be completely dropped by the user agent depending on implementation. At least I think that's what I was thinking...
And for those interested, but too lazy to look for it, the actual W3C definiton
http://www.w3.org/TR/REC-xml/#sec-cdata-sect
"CDATA sections MAY occur anywhere character data may occur; they are used to escape blocks of text containing characters which would otherwise be recognized as markup. CDATA sections begin with the string "<![CDATA[" and end with the string "]]>"
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