Muenchian Sorting with Substrings and Translated Strin

Hi,

I've got two issues I need to deal with in sorting a product list. Here's
some sample XML:
<List>
<Product>
   <ProductName>CFD 1-100</ProductName>
   <ProductFamily>1&quot; CFD</ProductFamily>
</Product>
<Product>
   <ProductName>CFD 1-100 Pro</ProductName>
   <ProductFamily>1&quot; CFD</ProductFamily>
</Product>
<Product>
   <ProductName>CFD 1.5-100</ProductName>
   <ProductFamily>1.5&quot; CFD</ProductFamily>
</Product>
<Product>
   <ProductName>CFD 2-100</ProductName>
   <ProductFamily>2&quot; CFD</ProductFamily>
</Product>
<Product>
   <ProductName>DSLA 1.5-100</ProductName>
   <ProductFamily>1.5&quot; DSLA</ProductFamily>
</Product>
<Product>
   <ProductName>DSLA 1-100</ProductName>
   <ProductFamily>1&quot; DSLA</ProductFamily>
</Product>
</List>

I'm sorting first by ProductFamily, and then by ProductName. I was doing
this first on MSXML and getting the result:

Family: 1&quot; CFD
   CFD 1-100
   CFD 1-100 Pro

Family: 1&quot; DSLA
   DSLA 1-100

Family: 1.5&quot; CFD
   CFD 1.5-100

Family: 1.5&quot; DSLA
   DSLA 1.5-100

Family: 2&quot; CFD
   CFD 2-100

My first challenge is that I want to change the ProductFamily sort so that
it groups first by the alpha characters, and then by the numerical ones. I
seems that I need to turn the value of ProductFamily into a string so I can
sort on substrings but that can't work.

My second challenge is similar -- this is migrating from ASP with MSXML to
PHP with Sablotron, and when I test it on Sablotron, the initial sort is
getting messed up by what appears to be a bug -- it doesn't seem to be
sorting the decimals, and instead gives me this:

Family: 1.5&quot; CFD
   CFD 1.5-100

Family: 1.5&quot; DSLA
   DSLA 1.5-100

Family: 1&quot; CFD
   CFD 1-100
   CFD 1-100 Pro

Family: 1&quot; DSLA
   DSLA 1-100

Family: 2&quot; CFD
   CFD 2-100

Again, it seems like the workaround is sorting on the value of a string,
this time with the translate() function applied to strip out the decimal
points. But again, that can't be done. Or can it? Does anyone have a good
idea for this one?

Here's the relevant parts of the XSL as they stand now:

<xsl:key name="FamilySort" match="Product" use="ProductFamily" />

<xsl:for-each 
select="document('../data/products.xml')/dataroot/Product[generate-id(.) =
generate-id(key('FamilySort', ProductFamily)[1])]">
        <xsl:sort select="./ProductFamily"/>
        <xsl:if test="not(. = preceding::ProductFamily)">
               <xsl:text>Family: </xsl:text>
               <xsl:value-of select="./ProductFamily"/>
        </xsl:if>
       <xsl:for-each select="key('FamilySort', ProductFamily)">
           <xsl:sort select="./ProductName"/>
           <xsl:variable name="ProductName" select="./ProductName"/>
       </xsl:for-each>
</xsl:for-each>    


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