It may be interesting to have a look at the matrix plugin in Protege. To have a Relational Data Model view on ABox.
For example here
The filling of class Edge looks like a table where column "name" keeps multiple values as data property is not functional.
And the "inc" column is for the object property to store multiple values of the opposite side of the particular Edge element.
So this is a way to look at ontology as RDB.
Alex