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Working With Structured Data Markup
This is the best introduction to Microdata, Schema, and Structured Data Markup I have been able to find. If you’re brand new to these practices, you might want to start here
Microdata is a form of identifier that can be combined with HTML as tags to further define your content to Google and other Search Engines. Microdata can be nested, much like standard HTML. We’ll use the example of an Unordered List and its List Items to correlate how microdata can be used.