Re: [xsl] using keys as cross-reference

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2002-01-20 07:38 -0800, Xiaocun Xu wrote:
>   I am interested to implement cross-reference using
> keys  (suggested by Jeni as well as documented in the
> XSLT Programmer Reference 2nd Ed. on p.501-3).
>   My situation is I have more readable headers in
> Excel (i.e. *Organization Unique ID)that needs to be
> translated into DTD attribute names (i.e.
> OrganizationCode).  I intend to put the name-value
> mapping in a separate XML, which I want to use keys to
> retrieve the translation.

This is not a problem because the <xsl:key> instruction builds a key table 
for every source file, not just the principle source file.

> Are there other more effective solutions?

All you need do is change your focus to the name-value file before calling 
the key() function, this will then give you the key() results from the 
name-value file instead of the principle source file.  This can be done 
with <for-each>.

I've thrown together something below to illustrate how this, though I have 
no idea how you were planning to get at your attribute values. I've just 
created a translation of the first attribute in each element.

I hope this helps.

........................... Ken


t:\ftemp>type xlate.xml
<?xml version="1.0" encoding="utf-8"?>
<categories>
  <category ref="OrganizationCode">Organization Unique ID</category>
  <category ref="OrganizationName">Organization Name</category>
</categories>
t:\ftemp>type xiaocun.xml
<?xml version="1.0" encoding="utf-8"?>
<items>
  <item OrganizationCode='123'/>
  <item OrganizationName='ABC Corporation'/>
  <item OrganizationCode='234'/>
</items>
t:\ftemp>type xiaocun.xsl
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:variable name="headings" select="document('xlate.xml')"/>

<xsl:key name="headings" match="category" use="@ref"/>

<xsl:output indent="yes"/>

<xsl:template match="/">
  <results>
    <xsl:for-each select="//item">
      <result>
        <xsl:variable name="attr" select="name(@*)"/>
        <xsl:for-each select="$headings">
          <xsl:value-of select="key('headings',$attr)"/>
        </xsl:for-each>
        <xsl:text>: </xsl:text>
        <xsl:value-of select="@*"/>
      </result>
    </xsl:for-each>
  </results>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>saxon xiaocun.xml xiaocun.xsl
<?xml version="1.0" encoding="utf-8"?>
<results>
   <result>Organization Unique ID: 123</result>
   <result>Organization Name: ABC Corporation</result>
   <result>Organization Unique ID: 234</result>
</results>
t:\ftemp>rem Done!



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