I wanted to keep tabs on the blog post that I am linking to here. It is a small portion of what I am about to be working towards as part of my masters project. Basically, this blog post talks about how you can query a database using SPARQL (a semantic web query language similar to SQL). To do this a mapping has to be made between the SPARQL query and the SQL query, which this blog writes about, and it points to a number of interesting applications that I have looked into in the past, but never really followed up (too busy with other projects I guess).
I guess I'll clarify this post in the future :-)