ZCML File
gadflyda.zcml

<zope:configure
    xmlns="http://namespaces.zope.org/browser"
    xmlns:zope="http://namespaces.zope.org/zope"
    >
<addform
    name="AddGadflyDA"
    schema="zope.rdb.interfaces.IManageableZopeDatabaseAdapter"
    permission="zope.ManageContent"
    label="Add Gadfly Database Adapter"
    fields="dsn"
    content_factory="zope.rdb.gadflyda.GadflyAdapter"
    arguments="dsn"
    />
<addMenuItem
    title="Gadfly DA"
    description="A DA for the built-in 100% Pure Python Gadfly Database"
    permission="zope.ManageServices"
    class="zope.rdb.gadflyda.GadflyAdapter"
    view="AddGadflyDA"
    />
</zope:configure>