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/dav"
    name="provideInterface"
    schema=".metadirectives.IProvideInterfaceDirective"
    handler=".metaconfigure.interface"
    />
</configure>