http://www.keywordoptimized.com SEO, PPC, Social Media Management Sat, 26 Dec 2009 07:52:23 +0000 http://backend.userland.com/rss092 en Just as texts in a natural language can include spelling or grammar errors, documents using Markup languages may (for various reasons) not be following these rules. The process of verifying whether a document actually follows the rules for the language(s) it uses is called validation, and the tool used for that is a validator. A document that passes this process with success is called valid. W3.org]]> http://www.keywordoptimized.com/blog/is-valid-code-important/