I believe the problem lies with the version of DocBook XSL that ships with Oxygen.  This issue has been recorded as an issue and fixed in the Github source files, but a new release needs to be made so it can be incorporated into Oxygen.

The fix is not simple, so feel free to contact me directly if you want to incorporate it into your stylesheet.

Bob Stayton
bobs@sagehill.net

Hi,

while docbook to pdf transformation does respect the different indices,
ant does not. Who may I have to contact and where to complain? The
following is totally mixed up.

   <index type="scName">
        <title>Scientific names</title>
    </index>
    <index type="dtName">
        <title>Deutsche Namensliste</title>
    </index>
    <index type="RWP">
        <title>Plants for Caterpillars</title>
    </index>
    <index type="idx">
        <title>General Index</title>
    </index>

Kind regards Bernhard

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