ZCML File
meta.zcml

<configure
    xmlns:meta="http://namespaces.zope.org/meta"
    xmlns:zcml="http://namespaces.zope.org/zcml"
    zcml:condition="have devmode"
    >
<include
    file="meta.zcml"
    package=".codemodule"
    />
<include
    file="meta.zcml"
    package=".bookmodule"
    />
<meta:provides
    feature="apidoc"
    />
</configure>