You might remember my last interview with Matthias Kaiser about semantics and apples.  In that interview Matthias addressed the aspect of objects and how  machines need to be able to give a description of an object the correct  meaning. In that interview Matthias used the example of an apple that  could either be something to eat or could also be a computer.
I  met with him again and this time Matthias explained to me two other  aspects of semantics. Machines don't just need to know what kind of  object (e.g. an apple) they have, but also what kind of context the user  has who e.g. searches for specific information. In the business world  this context is normally a role of a user in a company. Combining search  results of a user with a specific role and using that information for  other, maybe similar searches for users with the same role, makes a  search algorythm much more precise and relevant for an enterprise user.
But  it's not only about storing this information. It's also about being  able to let the machine "forget" certain information that might become  irrelevant over time. 
Listen to Matthias and find out what peanut  butter sandwiches have to do with all of this and how these concepts  find their way into SAP products.
I really loved talking to Matthias how he explained to me this  complex topics and during the interview he also started talking about a  new concept he developed called "Unified Information Access". But that  will be part of another interview with Matthias.