Just came across this article by “Torrance Design”.
Over the past year, we have been researching and testing the effects of markup hierarchy making a difference in search engine results. What I mean by markup hierarchy is that we want the unique and rich content to be at the highest point in the markup.
Why? First Read Chris Casarez’s Article
After several tests and reviews, we did see some improvements in search engine rankings as Chris Casarez (SEO Specialist at the Company) mentions in his article “Content Placement and Keyword Density matter“. The important aspect here is to move what the search engines loves to crawl to a higher point on the markup.
Although this is not recommended for every site out there, a lot of ecommerece sites with heavy headers and side columns may want to look into this technique to see if it has any positive effects on their rankings.
Full article can be found in here:
http://www.sohtanaka.com/web-design/markup-hierarchy-advantages-seo/
good post man, but i think that this herarchy is not important for SEO