Book auto index generation by xsl

<!--INPUT-->
<chapter>
<title>Computers and Technology in Education</title>
<sec1><p>Very early...</p>

<?docpage num="2"?>
<indexterm id="idx1">
<?indexkey C?>
<?primarykey Computers?>
<primary>Computers</primary>
<secondary>state in education</secondary>
</indexterm>
<indexterm id="idx2">
<?indexkey T?>
<?primarykey Technology competent?>
<primary>Technology competent</primary>
</indexterm>
<p>Very early...</p>

<!--OUTPUT-->
<?docpage num="3"?>
<indexterm id="idx3">
<?indexkey T?>
<?primarykey Technology expenditures?>
<primary>Technology expenditures</primary>
</indexterm>
<indexterm id="idx4">
<?indexkey N?>
<?primarykey Newsgroups.?>
<primary>Newsgroups.</primary>
<see><link linkend="idx9">Usenet</link></see>
</indexterm>
<p>Did something go wrong</p>

<?docpage num="4"?>
<indexterm id="idx5">
<primary>Computers</primary>
<secondary>state in education</secondary>
</indexterm>
<indexterm id="idx6">
<?indexkey S?>
<?primarykey Staff development, and technology implementation?>
<primary>Staff development, and technology implementation</primary>
</indexterm>
<indexterm id="idx7">
<?indexkey T?>
<?primarykey Teachers?>
<?secondarykey TRAINING?>
<primary>Teachers</primary>
<secondary>training</secondary>
</indexterm>
<indexterm id="idx8">
<primary>Technology expenditures</primary>
</indexterm>
<indexterm id="idx9">
<?indexkey U?>
<?primarykey Usenet?>
<primary>Usenet</primary>
</indexterm>

<?docpage num="5"?>
<indexterm id="idx10">
<?indexkey U?>
<?primarykey Usenet?>
<?secondarykey INDEX OF NEWSGROUPS?>
<primary>Usenet</primary>
<secondary>index of newsgroups</secondary>
</indexterm>
<p>Schools have responded</p>
</sec1>
</chap>

Thanks and Regards,
...JSR