confirm that namespaces may extend core elements with namespace attributes, as Microsoft has done in Internet Explorer 7. According to their view, a difference of interpretation left publishers unsure of whether this was permitted or forbidden. Comparison to email subscriptions Web feeds have some advantages compared to receiving frequently published content via an email: Users do not disclose their email address when subscribing to a feed and so are not increasing their exposure to threats associated with email: spam, viruses, phishing, and identity theft. Users do not have to send an unsubscribe request to stop receiving news. They simply remove the feed from their aggregator. The feed items are automatically sorted in that each feed URL has its own sets of entries (unlike an email box where messages must be sorted by user-defined rules and pattern matching). See also See Wikipedia:Syndication on how various aspects of Wikipedia can be monitored with RSS or Atom feeds. Web syndication feed: URI scheme Share icon References External links Change detection and notification Push technology Web syndication XML-based standards Atom (Web standard) RSS