Acquisition

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Simply put, any Zope object can acquire any object or property from any of its parents. That is, if you have a folder called A, containing two resources (a document called homepage and another folder called B), then an URL pointing at http://.../A/B/homepage would work even though B is empty. This is because Zope starts to look for homepage in B, doesn't find it, and goes back up to A, where it's found. The reality, inevitably, is more complex that this. For the whole story, see the Acquisition chapter in the Zope Book.