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<a wt=0.5 href=".......
where wt can be assigned a value between -1 to 1, we can link to a site with wt of -1 to criticize it; have link exchange with a lower PR site with wt of 0.1 while getting wt of 1 in return and so on.
Another problem area is the keyword. We all design sites with all tricks to convey to the SE which keywords we are targeting for. The keyword meta tag is generally ignored and was prone to misuse. What if we use the keyword meta tag, where alongwith the keywords we are allowed to provide the weights, and all weights adding up to 1 (or 100). It means we can concentrate of designing our sites better visually instead of thinking about h1 tags, keyword density et cetera and the Google won't have to spend time in figuring out, often wrongly, what our sites are all about. Spammers will try to span, there is no doubt about that but detection could be easier in this scenario.
I could go on but a new Google-friendly HTML language and a new Google-friendly HTML reading browser will be nice. What do you think? (Does this thread belong here, or anywhere else for that matter?)
Why bother extending HTML, when XHTML has it built in?