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Why do Google present links to sitemap xml files?

Searching for the phrase "resharper Visual studio 2011" on Google with a site:stackoverflow.com filter returns quite a few links without titles, and pages which return 404's on SO.

The search query I used was: http://www.google.com/search?&q=site:stackoverflow.com+resharper+%22visual+studio+2011%22

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I appreciate you don't have control over the Google index, just wondering what happened here and if you where aware of the situation.

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