The other way of representing space is as a collection of places that have a specific logical meaning; e.g., lab2 in the computer science building at the faculty of engineering.
Actually we are in a buidling if we are indoor, but in this class definition we focus on the "material" essence of the buidling
Just an example of indoor ontology- not intended to be exhaustive
This is one way to represent the physical space, i.e., as a set of points characterized by geometrical coordinates