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Re: xsl:sort/@case-order feature missed

Subject: Re: xsl:sort/@case-order feature missed
From: "Jonathan Perret" <jonathan@xxxxxxxxxxxx>
Date: Thu, 31 Jan 2002 13:53:05 +0100
Re:  xsl:sort/@case-order feature missed
> we are missing a neutral value for the
> xsl:sort/@case-order. We are using a 
> <xsl:sort ... case-order='{$which-order}'>
> within a parametrized template and would like
> to have all three cases for which-order:
> 1. lower-first
> 2. upper-first
> 3. no-particular-ordering-on-upper-and-lower
> Since we are using xsl:variables we cannot simply
> leave the case-order attribute away.

Suggestion : have two <xsl:sort> elements for the same
key, but only "enable" one of the two depending on the
presence of a case order :

    select="$which-order='lower-first' or $which-order='upper-first'" />
<xsl:variable name="used-order">
        <xsl:when test="$has-order">
            <xsl:value-of select="$which-order" />

I think this will correctly handle any value of $which-order that isn't
a recognized case-order. You can get rid of $has-order if you say that
$which-order should be false() or the empty node-set when 
a case-neutral sort is desired.

Finally, I haven't checked the spec but Mike May's book says that
case-order's value when not specified is language-dependant.
I understand this to mean that case-order always has a value,
so if you are sorting the following sequence :

<elt val="A" />
<elt val="a" />
<elt val="A" />

and you don't specify a case-order, it will sort as either A,A,a
or a,A,A depending on the language; but not the document
order A,a,A as you seem to imply by

I haven't tested this though so I may be totally wrong, or
it might be implementation-dependant.

Hope this helps.

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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