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The org.eclipse.sirius.business.api.delete.IDeleteHook interface and corresponding extension point (org.eclipse.sirius.deleteHook) are defined in the core plug-in but can only be configured from diagram descriptions (see org.eclipse.sirius.diagram.description.tool.DeleteHook, org.eclipse.sirius.diagram.description.tool.DeleteElementDescription.getHook() and org.eclipse.sirius.diagram.business.api.helper.delete.DeleteHookHelper). I don't think there's any good reason (other than historical ones) why the mechanism could not be available in other dialects too.