ZCML File
meta.zcml

<configure
    xmlns:meta="http://namespaces.zope.org/meta"
    >
<meta:directive
    namespace="http://namespaces.zope.org/zope"
    name="publisher"
    schema=".metadirectives.IRequestPublicationDirective"
    handler=".metaconfigure.publisher"
    />
</configure>