<configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:cache="http://namespaces.zope.org/cache"
    i18n_domain="plone">

    <include package="z3c.caching" />
    <include package="z3c.caching" file="meta.zcml" />

    <cache:ruleset
        for=".file.FilesystemFile"
        ruleset="plone.resource"
        />

    <!-- Unique resource ruleset lookup -->
    <adapter factory=".caching.UniqueResourceLookup" />

</configure>
