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Remember how each school would see a different layer? We have to be
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able to tell Zope which layer to use and that is done with a skin.
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The skin is in fact just a marker that gets attached to the request
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zope inspects the request object, it sees this special marker and
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looks for resources or views in one of the layers specified by the
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skin. The <q>special marker</q> is actually just an interface. This