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Why java parsers allow schema validation to be disabled?

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Question: Why SAX, DOM and JAXB allow schema validation to be disabled?

Answer: Many Java XML parsers, for example JAXB, DOM and SAX, can improve processing speed and/or to process documents containing invalid or incomplete content.

That's why they allow schema validation to be disabled.

For example, JAXB supports these processing scenarios also. Error handling is done by the exception handling. In general, if a JAXB implementation cannot unambiguously complete unmarshalling or marshalling, it will terminate processing with an exception.

If the client application does not set an event handler on its Validator, Unmarshaller, or Marshaller prior to calling the validate, unmarshal, or marshal methods, then a default event handler will receive notification of any errors or warnings encountered. The default event handler will cause the current operation to halt after encountering the first error or fatal error (but will attempt to continue after receiving warnings).


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