Saxon

Thanks for reporting it. SaxonCS is using a completely different software library to support decimal arithmetic; we didn't go out of our way to change the default precision for decimal division, but it's not surprising that it's changed, and the XPath specification doesn't require a specific number of digits. You can round the value to any precision you like using the round (or round-half-to-even) function, and there's also a Saxon extension function saxon:decimal-divide that gives a user-specified precision.

We'll think about changing the code to do what the documentation for saxon:decimal-divide says we do:

(The default for decimal division in Saxon using the div operator is to return max(18, s1, s2) decimal places in the result, where s1 is the scale of the first operand and s2 the scale of the second.)

Alternatively, we'll update the documentation. (In fact we need to do that anyway, because the Singulink library that we use in SaxonCS doesn't have the concept of the "scale" of a decimal value.)