Parse so-called User Defined IFC Property Sets
from an IFC file.
Parse entity attributes
Parse geometry
Follow the EXPRESS standard
etc. etc.
Industry Foundation Classes (IFC) is a standardized, digital description of a BIM model.
See IFC for more information.
A STEP-File is the file format that IFC uses.
Again, see IFC for more information.
Yes, the code is hand made. The parsing is not derived from an EXPRESS definition.
No, not yet. See open issues for more info