The pure virtual methods in this interface.

	endInputSource This method get called after the scanner has finished reading from the given input source while processing external entity references
	expandSystemId This method allows the passes the scanned systemId to the entity handler, thereby giving it a chance to provide any customized handling like resolving relative path names
virtual void	resetEntities() This method allows the entity handler to reset itself, so that it can be used again
	resolveEntity This method allows the entity handler to provide customized application specific entity resolution
	startInputSource This method will be called before the scanner starts reading from an input source while processing external entity references