I have read some literature on Boundary Representation of solids.
There are some commonly used data structures of BRep,
such as Winged-edge, half-edge, radial-edge representation schemes.
And I'm diged into the source code of the TopoDS package,
but I can't get any sense about what kind of representation scheme
OCC is using. Could any body tell me something about the technical
background of OCC's topological data structure?