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Re: generating ID strings that are both readable and

Subject: Re: generating ID strings that are both readable and unique
From: David Carlisle <davidc@xxxxxxxxx>
Date: Tue, 14 Oct 2008 09:59:06 +0100
Re:  generating ID strings that are both readable and
me> >  However this mechanism isn't possible in XSL 1.0
me> 
me> why not?




something like the following.
You'd need to fine tune the set of characters made safe (this makes
spaces into _ and discards !#,( but lets anything else through, and
doesn't take care to avoid digits etc being at the front of the id
but all those are probably fixable in practice.

David


<x>

  <section><title>Introduction with spaces!</title>...</section>
  ...
  <section id="examples"><title>Examples</title>...</section>
  <section><title>Examples</title>...</section>
  ...
  <section><title>Introduction with spaces!</title>...</section>
  <section id="foo"><title>og jhl</title>...</section>
  <section><title>og jhl</title>...</section>
  <section><title>og jhl</title>...</section>
  ...
</x>



<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 

 <xsl:template match="node()">
  <xsl:copy>
   <xsl:copy-of select="@*"/>
   <xsl:apply-templates/>
  </xsl:copy>
 </xsl:template>



 <xsl:key name="noid" match="section[not(@id)]" use="translate(title,' !#,()','_')"/>
 <xsl:template match="section[not(@id)]">
   <xsl:copy>
    <xsl:variable name="id" select="translate(title,' !#._,()','_')"/>
    <xsl:variable name="thisnode" select="generate-id()"/>
    <xsl:attribute name="id">
     <xsl:value-of select="$id"/>
     <xsl:for-each select="key('noid',$id)">
      <xsl:if test="position()!=1 and generate-id(.)=$thisnode">
       <xsl:text>-</xsl:text>
       <xsl:value-of select="position()"/>
      </xsl:if>
     </xsl:for-each>
    </xsl:attribute>
   <xsl:copy-of select="@*"/>
   <xsl:apply-templates/>
  </xsl:copy>
 </xsl:template>

</xsl:stylesheet>




$ saxon ids.xml ids.xsl
<?xml version="1.0" encoding="utf-8"?><x>

  <section id="Introduction_with_spaces"><title>Introduction with spaces!</title>...</section>
  ...
  <section id="examples"><title>Examples</title>...</section>
  <section id="Examples"><title>Examples</title>...</section>
  ...
  <section id="Introduction_with_spaces-2"><title>Introduction with spaces!</title>...</section>
  <section id="foo"><title>og jhl</title>...</section>
  <section id="og_jhl"><title>og jhl</title>...</section>
  <section id="og_jhl-2"><title>og jhl</title>...</section>
  ...
</x>

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