[xsl] Re: what is wrong when separating Muenchian method into two parts?

[Dimitre Novatchev <dnovatchev@xxxxxxxxx>]

Hi Yang,

The reason for the problem is that the key() function
operates on ***the current document***

So, when you have:

   <xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
 <xsl:value-of select="."/>
 <xsl:value-of  select="key('prodCode',.)/@ProductName"/>
   </xsl:for-each>

The xsl:for-each statement changes the current node to
msxsl:node-set($ppcodes)

Then the key function will not find the same matching nodes
in this new document as it would in the original xml source.


   <xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
 <xsl:value-of select="."/>
 <xsl:value-of  select="key('prodCode',.)/@ProductName"/>
   </xsl:for-each>


What will work is something like this:

<xsl:variable name="originalDoc" select="/"/>

<xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
  <xsl:variable name="thisPP" select="."/>

  <xsl:for-each select="$originalDoc"> 
    <xsl:value-of select="$thisPP"/>
    <xsl:value-of  select="key('prodCode',$thisPP)/@ProductName"/>
  </xsl:for-each>
</xsl:for-each>

Dimitre Novatchev.


"Yang" <sfyang at unisvr dot net dot tw> wrote:

Hi,

Please someone help me out of the following problem;

1. I use Muenchian method to get the a unique set of product codes
   and save it into the node-set of'"ppcodes".

   <xsl:param name="OrderLine" select="//z:row"/>

   <xsl:variable name="ppcodes">
 <xsl:for-each
select="$OrderLine[generate-id(.)=generate-id(key('prodCode',(@ProductCode))
[1])]">
       <pp>  <xsl:value-of select="@ProductCode"/></pp>
 </xsl:for-each>
</xsl:variable>

2. Then read back each product code from the node-set ($ppcodes) and pass it
to
   key('prodCode',.) funtion  to access the data.

   <xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
 <xsl:value-of select="."/>
 <xsl:value-of  select="key('prodCode',.)/@ProductName"/>
   </xsl:for-each>

   However this plot seems not workable, i.e. I can not get correct
information
   from key function.     I wonder I have misused Muenchian method somehow?

3. To verify the point I have directed following tests by giving a specific
data
   in the key function with following codes,

    <xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
         <xsl:value-of select="."/>
         <xsl:value-of  select="key('prodCode','000001')/@ProductName"/>
   </xsl:for-each>

    and found out that;

  3-1.  when removing out
        <xsl:for-each  select="msxsl:node-set($ppcodes)/pp">
        the key function works normally.

  3-2.  But when including xsl:value-of,   the following key function is
       completely ignored.

       To me, I am only separating a regular Muenchian method routine into
two parts. However I may get lost
       somewhere in basic principle of using this method.

       Thanks your helpful input in advance.

     Sun-fu Yang,
     sfyang@xxxxxxxxxxxxx





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