Stylesheet

<xsl:stylesheet version="1.0">

<!--
This stylesheet expands author's id into a full name. Variable $authorlist must contain the node
set of the author list document. It is assigned e.g. in the index.xsl stylesheet. The stylesheet is
intended to be imported into another stylesheet.
-->

<xsl:key name="author" match="//c:author" use="@id"/>

<xsl:template match="c:author" name="c-author">
  <xsl:param name="autid"><xsl:value-of select="."/></xsl:param>
  <xsl:for-each select="$authorlist">
    <xsl:variable name="aut" select="key('author', $autid)"/>
    <xsl:choose>
      <xsl:when test="$aut">
        <xsl:choose>
          <xsl:when test="$aut/c:fullname">
            <xsl:apply-templates select="$aut/c:fullname"/>
          </xsl:when>
          <xsl:otherwise>
            <xsl:apply-templates select="$aut/c:firstname"/>
            <xsl:text/>
            <xsl:apply-templates select="$aut/c:surname"/>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:when>
      <xsl:otherwise>
        <font color="red"><u><xsl:value-of select="$autid"/></u></font>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:for-each>
</xsl:template>

<xsl:template match="c:surname|c:firstname|c:initials|c:fullname">
  <xsl:apply-templates/>
</xsl:template>

</xsl:stylesheet>

auth.xsl