Id-to-xml-id.xslt

<nowiki><?xml version="1.0" encoding="UTF-8"?>
<!-- Tiny XSLT 1.0 stylesheet that reads in a TEI P4:2004 file (or -->
<!-- any other XML file, really) and writes out the same file with -->
<!-- the id= attribute changed to the xml:id= attribute. -->
  
<!-- Copyleft 2006 Syd Bauman and the Text Encoding Initiative Consortium -->

<!-- The output of this stylesheet is not P5-comnpliant XML; it is just -->
<!-- the same P4 document with xml:id= instead of id=. -->
<!-- Note that if an element already has both an id= and an xml:id=, we -->
<!-- nuke the old xml:id= and replace it with what used to be id= (and -->
<!-- issue a warning). -->

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:tei="http://www.tei-c.org/ns/1.0"
  version="1.0">
  
  <xsl:output method="xml"
    encoding="UTF-8"
    cdata-section-elements="eg"/>
  
  <!-- Generic copy-everything template -->
  <xsl:template match="@*|*|processing-instruction()|comment()">
    <xsl:copy>
      <xsl:apply-templates select="*|@*|text()|processing-instruction()|comment()"/>
    </xsl:copy>
  </xsl:template>
  
  <!-- special template for elements with id= that have to change -->
  <xsl:template match="*[@id]">
    <xsl:if test="@xml:id">
      <xsl:message>WARNING: deleting the existing xml:id=<xsl:value-of select="@xml:id"/> attribute of <<xsl:value-of select="name(.)"/> id=<xsl:value-of select="@id"/>>.</xsl:message>
    </xsl:if>
    <xsl:element name="{name(.)}">
      <xsl:attribute name="xml:id">
        <!-- For the value of the new xml:id= attribute use id= ... -->
        <xsl:value-of select="@id"/>
      </xsl:attribute>
      <!-- Now copy over all other attributes (i.e., all but id= and xml:id=) -->
      <xsl:copy-of select="attribute::*[not(name()='id') and not(name()='xml:id')]"/>
      <!-- Now copy over all the content -->
      <xsl:apply-templates select="./*|./text()|./processing-instruction()|./comment()"/>
    </xsl:element>
  </xsl:template>
  
</xsl:stylesheet>

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