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The with-* macros allow to render a block of wiki markup in the context of another page (assuming the user has permissions to access the other page).

For instance, from the current page, you could call the {with-ancestors} macro to search for parent pages (up the page tree) matching the given criteria. The body of the {with-ancestors} macro would then be rendered, in the current page, using the page found by the macro as the context.

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