For example: Simple "show source" of http://www.ebay.com shows that Ebay stores images on several different domains (e.g. ebaystatic.com or ebayimg.com). If you're planning to web-archive similar content you will probably need to set this property to False.
By default RootDomainOnly is set to False.
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WebArchiveX API - WebArchiveX Website - C Systems Website -