RDFa is an extension to HTML5 that helps you markup things like People, Places, Events, Recipes and Reviews. Search Engines and Web Services use this markup to generate better search listings and give you better visibility on the Web, so that people can find your website more easily.
2012. Metadata Statistics for a Large Web Corpus
ABSTRACT
We provide an analysis of the adoption of metadata standards on the Web based a large crawl of the Web. In particular, we look at what forms of syntax and vocabularies publishers are using to mark up data inside HTML pages. We also describe the process that we have followed and the difficulties involved in web data extraction.
T. Tunsch. EVA Berlin 2019: elektronische Medien & Kunst, Kultur, Historie; Konferenzband; die 26. Berliner Veranstaltung der Internationalen EVA-Serie Electronic Media and Visual Arts; 7. - 8. November 2019, Kunstgewerbemuseum am Kulturforum Potsdamer Platz, Berlin / eine Kooperation zwischen den Staatlichen Museen zu Berlin, Preußischer Kulturbesitz u. dem Deutschen Zentrum für Luft- und Raumfahrt e.V. - Institut für Optische Sensorsysteme, Seite 105--111 (print) 107--113 (PDF). Berlin, Staatliche Museen zu Berlin und Deutsches Zentrum für Luft- und Raumfahrt e.V. - Institut für Optische Sensorsysteme, (2019)