Semantic MediaWiki (SMW) is an extension to MediaWiki (the wiki software implementation that Wikipedia and other sites run), that allows for the encoding of semantic data within wiki pages, thus turning a wiki that includes the extension into a semantic wiki. Data that has been encoded can be used in semantic searches, used for aggregation of pages, and exported to the outside world via RDF. As an example, a page about Berlin could have, encoded within it, the fact it is the capital of Germany. On the page "Berlin", the syntax would be: