Florian Wenzel discussed how the Preference SQL system developed at the Chair for Databases and Information Systems at the University of Augsburg can be efficiently employed in LBS to provide such an alternative soft constraint search paradigm with best-matches-only query semantics.
[slideshare id=23522080&doc=dbisgeomonday-130626120215-phpapp02]
[youtube=http://youtu.be/4IHLH5RIEYc]
[youtube=http://youtu.be/YfPhlx6qZys]