Exceptions and Errors
The XML specification defines three classes of problems that can occur in an XML document. In order of decreasing severity, these are as follows:
Fatal Error
A well-formedness error. As soon as the parser detects it, it must throw in the towel and stop parsing. The parse() method throws a SAXParseException when a fatal error is detected. Parsers have a little leeway in whether they detect fatal errors. In particular, nonvalidating parsers may not catch certain fatal errors that occur in the external DTD subset, and many parsers don't actually check everything they're supposed to check. However, if a parser does detect a fatal error, then it must give up and stop parsing.
Error
An error but not a well-formedness error. The most ...
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