The RDF stack

RDF has evolved over the years, and a number of incredibly powerful layers have been built upon it. For example, reasoning software can make use of RDF statements to work out other statements. To illustrate, it may be the case that some system knows the following facts:

XTech 2006 has a venue of Amsterdam

XTech 2006 has a start date of May 16th

XTech 2006 has an end date of May 19th

If the system also discovers that:

XTech has a speaker of Mark

then it could deduce that on May 18th:

Mark has a location of Amsterdam