The semantic web and schemas?
TL;DR: how RDFaL and HTML interact.
For a while now, I have been working on my Jekyll theme, structRDFaL, which is meant to make generating structured data in accordance with schema.org easier. As stated, improving SEO for your site is a secondary concern for paying attention to schemas. It should be about best practices and being a good netizen with just a little bit more effort.
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