[Bug 10073] Problems with the definitions of the trigonometric functions (math:)

http://www.w3.org/Bugs/Public/show_bug.cgi?id=10073





--- Comment #8 from Michael Kay <mike@saxonica.com>  2010-07-05 16:32:41 ---
>For problem 7. I simply wonder how the requirement to return "the nearest
higher xs:double or the nearest lower xs:double" can be tested in practice.

Based on past experience:

(a) Someone will submit a test together with the result that their
implementation returns

(b) If any other implementor gets a value that differs from this, they will
argue about it until we are satisfied what the correct answer is, and either
add a second permitted result or change the expected result accordingly.
Because there are only two legitimate results, this process seems quite
manageable. Verifying the correct answers needs access to a quad- or
variable-precision trig library, there is surely one available somewhere.

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Received on Monday, 5 July 2010 16:32:43 UTC