What does NSXMLParserUndeclaredEntityError mean?

When using NSXMLParser, what does NSXMLParserUndeclaredEnti开发者_StackOverflow社区tyError mean? Apples documentation is completely unhelpful

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Have a look at the first answer on Resolving html entities with NSXMLParser on iPhone where it lists the standard supported entities. Are you able to post your XML that you're parsing?

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You get the NSXMLParserUndeclaredEntityError when you use a special character that isn't expected by the NSXMLParser for example &foo;

The only valid special characters that the NSXMLParser will recognize are:

<
>
'
"