ZCML File
apidoc.zcml

<configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:apidoc="http://namespaces.zope.org/apidoc"
    xmlns:zcml="http://namespaces.zope.org/zcml"
    i18n_domain="zope"
    zcml:condition="have apidoc"
    >
<apidoc:bookchapter
    id="indexcatalog"
    title="Indexes and Catalogs"
    />
<apidoc:bookchapter
    id="catalog"
    title="Catalog"
    doc_path="README.txt"
    parent="indexcatalog"
    />
<configure
    package="zope.index"
    >
<apidoc:bookchapter
    id="fieldindex"
    title="Field Indexes"
    doc_path="field/README.txt"
    parent="indexcatalog"
    />
<apidoc:bookchapter
    id="testindex"
    title="Text Indexes"
    doc_path="text/textindex.txt"
    parent="indexcatalog"
    />
</configure>
</configure>