Canonical URLs
Starting in Tiki7, for better Search Engine Optimization, Canonical URLs are now on by default. This is deployed for a few features in 7.x and more will be added for 8.x
example code
<link rel="canonical" href="http://themes.tiki.org/Sample+page" />
Ref:
http://www.seomoz.org/blog/canonical-url-tag-the-most-important-advancement-in-seo-practices-since-sitemaps
