It is a fact that search engines perform badly with wiki images, as they don't
index pages on image: namespace, assuming it will be an image and not a html
description.
See Commons search engine ranking thread on commons-l
(http://permalink.gmane.org/gmane.org.wikimedia.commons/1289) for more info. The
engines approach is not bad per se (what do you think when you see a .jpg ended
url?) but we're not giving a different information. Thus we should tag the links
in images with the type attribute indicationg the mime of linked document, as it
is done with <style> and <script> (yes, type is a valid attribute of <a>)
http://permalink.gmane.org/gmane.org.wikimedia.commons/1323
Version: unspecified
Severity: enhancement