6.1 Navigating the Semantic Web

	For the Internet, we use a web browser for navigation. For the Semantic Web, we can use a Semantic Web browser.
	In addition to Semantic Web browsers, there are also RDF browsers. The former dereferences resolvable URIs, enabling a continuous exploration of browser-accessible triples, while the latter visualizes RDF triples typically based on a local RDF data store.
	There is not universal agreement on this distinction as some technologists still refer to both as RDF browsers. Several options are available, such as the Tabulator Extension for Firefox (http://dig.csail.mit.edu/2007/tab/), OpenLink’s RDF Browser (http://demo.openlinksw.com/DAV/JS/rdfbrowser/index.html), and Disco (http://www4.wiwiss.fu-berlin.de/bizer/ng4j/disco/), to name a few.
	Our discovery is limited only by the quantity and quality of data people publish in RDF. Note that this type of navigation is dependent on the fact that URI’s are resolvable.
	Plenty of RDF stores don’t have resolvable URIs (for example, using www.example.org as a hostname) and therefore won’t work for browser-based navigation.
	Navigation can quickly become cumbersome as information discovery becomes a regular task. In addition, there simply isn’t sufficient time to navigate through enough data sources to solve questions when we have them.