is a collaboration from several search engines, defining logic data model and vocabulary for structured data based on entity relationships model. It has proposed in the model the set of entities, their object and data properties. is complex data model proposed by Google, Yahoo, others for search engine optimization task. The sets of entities were described by which can be described by an instance of other . As result, proposed data model describes so deeply the complex graph-oriented relationships among entities and their properties what is very useful for working with and knowledge-driven intellectual systems. is a community-created vocabulary (sponsored by Google, Microsoft, Yahoo and Yandex) for describing entities on webpages, in emails etc. It is commonly used with the , , or syntax and it is considering a support for search engine too.

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