Is W3C Valid XHTML and CSS Code, Semantic and Accessible Mark-up enough for site's SEO?

Posted by metal-gear-solid on Stack Overflow See other posts from Stack Overflow or by metal-gear-solid
Published on 2010-04-18T13:07:57Z Indexed on 2010/04/18 13:13 UTC
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XHTML

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css

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semantic-markup

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seo

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w3c-validation

I created a web-site for a client with W3C Valid XHTML and CSS Code, Semantic and Accessible Mark-up and I had said to client my code will be SEO friendly. Theyway i code it will be good for your site SEO. I putted my all efforts to make good code

Now my non-techie Client is asking me, Should him go for any SEO company even after providing SEO friendly site by me?

What other SEO companies will do for him other than what we can't by W3C Valid XHTML, CSS , Semantic and Accessible Mark-up?

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