JohnRoy - 3:48 am on Feb 11, 2011 (gmt 0)
Just googled and found a seo provider' page titled "Semantic SEO":
If you were to choose only one SEO strategy what would be it?
I have not read or heard this anywhere, just an intuition.
(lots of fancy stuff..)
We use Content Strategies, Syndication, Meaningful Markup, and an assortment of SEO techniques and strategies coupled with emergent Semantic Web tools and technologies to radically increase Return on Investment for our clients.
IMHO, there's NO "only one strategy". To reduce the burdon, I would prefer content plus content plus links and then repeat.
Validated html is just another item in the list, as is robots.txt, good site structure, and meta=description... If you choose "only" validated html, it will make no major difference in serps.