ZCML File
configure.zcml

<configure
    xmlns="http://namespaces.zope.org/zope"
    >
<include
    file="adapters.zcml"
    />
<include
    file="classes.zcml"
    />
<include
    file="subscribers.zcml"
    />
<include
    file="apidoc.zcml"
    />
</configure>