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Besides the three standard error handlers RiErrorIgnore, RiErrorPrint (default) and RiErrorAbort the module provides an additional error handler called RiErrorException. Whenever an error occurs RiErrorException raises the exception RIException.
If you install a new error handler with RiErrorHandler() only the three standard error handlers will produce an output in the RIB stream, if you install RiErrorException or your own handler then the handler is installed but no RIB output is produced.
The module does some error checking, however there are still quite a bit of possible error cases that are not reported. For example, the module checks if parameters are declared, but it is not checked if you provide the correct number of values. In general, the module also does not check if a function call is valid in a given state (e.g. the module won't generate an error if you call RiFormat() inside a world block).
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