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> The tough constraint is that the 'units', 'min', 'max', and
> 'default' attributes must be dimensionally compatible.
> So for example
> name = "OMEGA"
> units = "radian/sec"
> min = "0 deg/sec"
> max = "1000 rpm"
> default = "10 hz"
> would be legal, but 'units = "meter/sec", default="5 feet"'
> would not be.
> I don't know of any schema language that can enforce this
> constraint (and if there were one, I doubt that I'd want
> to use it :-). We use a combination of DTDs, Schematron,
> and Tcl for validation.
I think you can check these using Schematron. You can divide up
an attribute value into tokens and treat the tokens as numbers and