Message text written by James Clark
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The "shall at user option report warning message" bit doesn't work for me.
The processor may not be running interactively. A RELAX NG processor might
be built into the firmware of a fridge. An implementation may have not any
way to report an error or to support user options.
I think the critical point that the spec needs to make is that a RELAX NG
processor does not become non-conformant merely because it does not support
some datatype library. Also if an implementation claims conformance, it
should as part of that claim state what datatype libraries it supports.
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I like this approach. In closed systems, you should always know where the
walls start and end.
DW.