| David Carlisle
This only does two level indices.
You could either just extend to deeper levels, or probably
better parameterise the templates on the level, but anyway
something to get you started...
XML source file
<x> <p><index level1="Accommodation
" />accom</p>
<p><index level1="Abandonment"
level2="international policy
of"/>aband/intl</p> <p><index
level1="Accommodation"
/>accom</p> <p><index
level1="Accommodation" level2="foreign
funding and"/>accom/foreign</p> <p><index
level1="Abandonment" level2="international policy
of"/>aband/intl</p> <p><index
level1="Accommodation"
level2="right wing and"/>accom/rw</p>
<p><index
level1="Accommodation" level2="foreign funding
and"/>accom/foreign</p> <p>
<index level1="Abortion"
/>abort</p> <p><index
level1="Accommodation" />accom</p>
<p><index level1="Accommodation"
level2="right wing
and"/>accom/rw</p>
<doindex/>
</x>
Output HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<br>
[N4]<a name="N4"></a>accom
<br>
[N9]<a name="N9"></a>aband/intl
<br>
[N15]<a name="N15"></a>accom
<br>
[N20]<a name="N20"></a>accom/foreign
<br>
[N26]<a name="N26"></a>aband/intl
<br>
[N32]<a name="N32"></a>accom/rw
<br>
[N38]<a name="N38"></a>accom/foreign
<br>
[N44]<a name="N44"></a>abort
<br>
[N49]<a name="N49"></a>accom
<br>
[N54]<a name="N54"></a>accom/rw
<div class="index"> <h2>Index</h2> <a
name="index"></a>
<ul class="nobull">
<li> <b>Abandonment</b> <ul>
<li>international policy of: <a
href="#N9">link</a>, <a
href="#N26">link</a>
</li> </ul> </li> <li>
<b>Abortion</b>: <a
href="#N44">link</a> </li> <li>
<b>Accommodation</b>: <a
href="#N4">link</a>, <a
href="#N15">link</a>, <a
href="#N49">link</a> <ul>
<li>foreign funding and: <a
href="#N20">link</a>, <a
href="#N38">link</a> </li>
<li>right wing and: <a
href="#N32">link</a>, <a
href="#N54">link</a> </li>
</ul> </li> </ul> </div>
XSL Stylesheet.
<!-- index.xsl Index Generation Module-->
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Tranform"
version="1.0">
<xsl:output method="html" indent="yes"/>
<xsl:template
match="index"> <br/> [<xsl:value-of
select="generate-id(.)"/>]<a
name="{generate-id(.)}"></a>
</xsl:template>
<xsl:template match="doindex">
<xsl:call-template name="book.index"/>
</xsl:template>
<xsl:template name="book.index">
<div class="index">
<h2>Index</h2>
<a name="index"></a>
<ul class="nobull">
<xsl:apply-templates
select="//index[
not(@level1=following::index/@level1)]"
mode="index.mode">
<xsl:sort select="@level1"/>
</xsl:apply-templates>
</ul>
</div>
</xsl:template>
<xsl:template match="index" mode="index.mode">
<li><b><xsl:value-of
select="@level1"/></b>
<xsl:apply-templates
mode="index.link"
select="//index[@level1=current()/@level1 and
not(@level2)]"/>
<xsl:if test="//index[@level1=current()/@level1
and @level2]">
<ul>
<xsl:apply-templates select=
"//index[@level1=current()/@level1 and
@level2 and not(@level2=following::index/@level2)]"
mode="index.mode2">
<xsl:sort select="@level2"/>
</xsl:apply-templates>
</ul>
</xsl:if>
</li>
</xsl:template>
<xsl:template match="index" mode="index.mode2">
<li><xsl:value-of select="@level2"/>
<xsl:apply-templates
mode="index.link"
select="//index[@level1=current()/@level1
and @level2=current()/@level2
and not(@level3)]"/>
</li>
</xsl:template>
<xsl:template match="index" mode="index.link">
<xsl:if test="position()=1">: </xsl:if>
<a href="#{generate-id(.)}">link</a>
<xsl:if test="position()!=last()">, </xsl:if>
</xsl:template>
</xsl:stylesheet>
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