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\url{http://tinyurl.com/gljaylt}}  Explained on an example, each Wikipedia article about Berlin\footnote{There are 229 entries for Berlin} has a link to the Wikidata page Berlin\footnote{Wikidata page of Berlin:   \url{https://www.Wikidata.org/wiki/Q64}} The Wikidata page of Berlin is refered referred  as item. The items have several values assigned to properties, providing detailed additional information, also known as "claim", depending on the data type. That forms the key structures of Wikidata. In the following, each piece of the structure will be briefly explained. \subsection{Item}