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The note at the bottom of 19.1.2 says: > The string representations of numeric values are backwards compatible with > XPath 1.0 except for the special values positive and negative infinity, > negative zero and values outside the range 1.0e-6 to 1.0e+6. I assume what is meant here is actually: * The range between 0 and +/- 1.0e-6 * The range between +1.0e6 and up * The range between -1.0e6 and lower I don't think the text will really puzzle readers, but I think it is not technically precise enough as it is written (unless what's written is correct, I don't know enough of the XPath 1.0 spec to be sure).