ZCML File
meta.zcml

<configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:meta="http://namespaces.zope.org/meta"
    >
<meta:directive
    namespace="http://namespaces.zope.org/rdb"
    name="provideConnection"
    schema=".zcml.IProvideConnectionDirective"
    handler=".zcml.connectionhandler"
    />
<meta:directive
    namespace="http://namespaces.zope.org/rdb"
    name="gadflyRoot"
    schema=".gadflyzcml.IGadflyRoot"
    handler=".gadflyzcml.gadflyRootHandler"
    />
</configure>