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* ErrorMultiplexer is derived from both xercesc::ErrorHandler and xalan::ProblemListener
* registers itself as XalanTransformer's ErrorHandler and ProblemListener
* distributes captured errors and warnings to all registered ErrorMultiplexer::Receiver instances
** ErrorCapacitor implements the ErrorMultiplexer::Receiver interface and as such registers itself in a given ErrorMultiplexer instance
** ErrorMultiplexer reduces the different xalan and xercesc internal error classifications into either warnings or errors
* this was implemented to make it possible to easily differentiate between warnings and errors
** previously warnings were treated as errors
** ErrorCapacitor ignores warnings and only captures errors
** WarningCapacitor will be implemented to handle warnings during XSLT processing
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* added entity, line and column information
* formatting analog to ErrorCapacitor warning messages
** i.e. this commit implements functionality similar to "xalanc::ProblemListenerBase::defaultFormat" for "xercesc::ErrorHandler" exceptions
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* xalan::ProblemListenerBase provides a static member method called "defaultFormat"
** this method provides formatting of problem messages into xalan::XalanDOMString instances when combined with xalan::DOMStringPrintWriter
* there is no need for implementing custom message formatting
** the only reason why ErrorCapacitor exists is so we are able to capture and print messages at our own volition
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* ErrorHandler is replaced by ErrorCapacitor
** temporarily registers itself as both the ProblemListener and ErrorHandler of a given XalanTransformer instance
** deregisters itself on destruction
** collects all problems and errors during its lifetime inside a internal std::vector<std::string> instance
** if this instance is not empty it is thrown contained within a ErrorCapacitor::exception by the member method ErrorCapacitor::discharge
* this enables using the same code for handling transformation compilation and generation errors and problems
* updated test frontend accordingly
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