SMW Cloud: A Corpus of Domain-Specific Knowledge Graphs from Semantic MediaWikis

Semantic wikis have become an increasingly popular means of collaboratively managing Knowledge Graphs. They are powered by platforms such as Semantic MediaWiki and Wikibase, both of which en- able MediaWiki to store and publish structured data. While there are many semantic wikis currently in use, there has been little effort to col- lect and analyse their structured data, nor to make it available for the research community. This paper seeks to address this gap by systemat- ically collecting structured data from an extensive corpus of Semantic- MediaWiki-powered portals and providing an in-depth analysis of the ontological diversity (and re-use) amongst these wikis using a variety of ontological metrics. Our paper aims to demonstrate that semantic wikis are a valuable and extensive part of Linked Open Data (LOD), and in fact may be considered an own active “sub-cloud” within the LOD ecosystem, which can provide useful insights into the evolution of small and medium-sized domain-specific Knowledge Graphs.