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This capability currently does not exist, mainly due to the difficulty of detecting retrieval success for web-based documents (specifically web pages).
When a url is no longer available, a 404 or other html page (such as a domain hosting service advertisement!) might be retrieved (with no actual retrieval error code). This situation is essentially undetectable by Ultra Recall without user intervention (from the application's perspective, the erroneous html page is valid html content and therefore replaces the existing referenced or stored web page).
If this happens automatically or in "batch mode", the user could potentially lose large amounts of stored document information without their knowledge. That, of course, would probably be very unacceptable...
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