Semantic markup for better search results

Search-engines have reached a impasse with respect to understanding of HTML data. Although most sites, especially databases centric sites use structured data in the backend, once the data is rendered as HTML the data looses all its structure and makes it difficult for search engines to understand them correctly. Until now most search engines have relied on extracting keyword text from the web pages and ranking the pages accordingly, taking the context around the keyword into consideration. This obviously has its limitations and it can only take you so far.
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