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At 3:55 PM -0400 7/6/02, Jonathan Robie wrote:
>That's not layering, that's deciding that data is not typed unless I
>require explicit casts, convert it to Java or relational data, or
>whatever. And that makes many simple examples come out wrong, eg:
>
> let $x := <foo xsi:type="decimal">39.42</foo>
> let $y := <foo xsi:type="decimal>147.23</foo>
> return
> if ($x < $y)
> then "x is less"
> else "y is less"
>
>Your approach would mean that the above query would return "y is
>less". Trust me, many users of XQuery would not like that.
>
No it wouldn't, at least not with any reasonable less than operator.
Such an operator should either convert its arguments to numbers or
fail with a syntax error or perhaps an exception. If you're using a
numeric operator to do string comparisons or document order
comparisons or something like that, then that's the mistake, not the
absence of explicit typing.
--
+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
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| XML in a Nutshell, 2nd Edition (O'Reilly, 2002) |
| http://www.cafeconleche.org/books/xian2/ |
| http://www.amazon.com/exec/obidos/ISBN%3D0596002920/cafeaulaitA/ |
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