On purpose to visualize the semantic content of MediaWiki, I wrote a WebService as a MediaWikiExtension. With this WebService it would be possible to create independent visualizations outside of MediaWiki with the technologie of your choice. The WebService proposes the semantic net content of MediaWiki through tree médthods:
This method returns the different topic names of the MediaWiki plateform. Topics can be of different types: existing or wanted category, existing or wanted article, author, image. The methode returns an array : (topicTypeName => array(array(name, url))).
This method returns an array with the topic name, his type, the number of links to this topic, the URL and an array with all links from this topic to other topics (each link is an array(name, type, url)) types can be: existing or wanted category, existing or wanted article, author, image. If no topic matches to the term sent, NULL is returned.
This method returns the semantic content of the MediaWiki platform in XTM (Topic Maps) standardised format. You can read the returned topic map with applications like TMNav and TMBrows from TM4J.org or Omnigator from ontopia.net. The returned topic map file is an XML file respecting the XTM dtd with the extension "xtm".
MediaWiki-WebService uses the NuSOAP library: NuSoap
You can get the WebService Package here: SemanticWiki
An example of a WebService-Client you will find here: WebService-Client