Re: What will be the future improvements of XSLT?

[David Carlisle <davidc@xxxxxxxxx>]

> I am trying very hard not to use extension functions.

I agree, one could imagine though an XSL n+1 allowing extension
functions written in xsl, ie essentially just syntactic sugar for
calling a named template.

> Going back to the original question; other than using
> extension functions, can I do this kind of sorting in XSLT at all?

as always there is the more or less inelegant solution of using the only
datatype over which you have real programatic control, namely strings.

If you had a function that mapped your enumerated type to
the numbers 1 2 3 then you could use that in the sort specification.

given
<xsl:variable name="tour" select=
 "'PGA1:LPGA2:Senior PGA3:'"/>

then
substring-before(substring-after($tour,@tour),':')
is just such a function, and 

<xsl:stylesheet 
  xmlns:xsl="http://www.w3.org/XSL/Transform/1.0";
  >            
<xsl:variable name="tour" select=
 "'PGA1:LPGA2:Senior PGA3:'"/>

<xsl:template match="test">
<xsl:apply-templates select="xxx">
 <xsl:sort select="substring-before(substring-after($tour,@tour),':')"/>
 <xsl:sort select="@name"/>
</xsl:apply-templates>
</xsl:template>

<xsl:template match="xxx">
[<xsl:value-of select="@tour"/>, <xsl:value-of select="@name"/>]
</xsl:template>

</xsl:stylesheet>


converts


<test>
<xxx tour="LPGA" name="y"/>
<xxx tour="LPGA" name="x"/>
<xxx tour="Senior PGA" name="x"/>
<xxx tour="PGA" name="y"/>
<xxx tour="Senior PGA" name="y"/>
<xxx tour="PGA" name="x"/>
<xxx tour="PGA" name="z"/>

</test>

to 
bash-2.01$ xt golf.xml golf.xsl 

[PGA, x]

[PGA, y]

[PGA, z]

[LPGA, x]

[LPGA, y]

[Senior PGA, x]

[Senior PGA, y]
bash-2.01$ 


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