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Subject: Re: [office-formula] New draft of openformula specification

"David A. Wheeler" <dwheeler@dwheeler.com> wrote on 07/14/2006 06:12:51 PM:

> I'm going to back off the comparison description slightly, and insert a TODO
> asking for help.  Can anyone give me good text on how comparison should
> work in spreadsheets in a modern international world when it's NOT
> case-sensitive?
> I've put in SOME text that makes sense, but help wanted.
> I'll release a new version of the spec in just a moment.

For what it is worth, Excel seems to process terminal sigma correctly in their implementation of lower().  It also seems to use collation order based string comparisons.  Since spreadsheets are more end-user business application than programming languages I think users would expect this level of native language support.

http://www.unicode.org/reports/tr10/ is the standard that I came up with.  Since it is also the reference cited by James Clark for the XSLT specification, I'll give it the presumption of correctness.

Note to implementors -- the easiest path getting this right is to either to use Java (since collation support is included in the standard libraries) or use ICU (International Components for Unicode http://icu.sourceforge.net/) an open source project that gives similar support in portable C code.


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