Need to have duplicate item urls/GUIDs in RSS

I'm working on a tool to publish videos in a play开发者_Python百科list, with the option to download as a podcast. Sometimes, items will need to be repeated over the course of the podcast. Having duplicate items or GUIDs causes problems though.

Does anyone know of a way to be able to have duplicates?

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By definition <guid> have to be unique :) So there is probably no way of doing it that wouldn't cause issues with most agregators.