Similar to Teigha Drawings, Teigha BIM also has visual styles for rendering elements in a View. However, with Teigha Drawings visual styles are separate elements in the database, and with Teigha BIM visual styles are part of the View.
Many elements in Teigha BIM contain B-Rep geometries in GElement, which is a geometry cache of an element. However, B-Rep is not a universal format. Each product has a specific representation of B-Reps.
An overview of B-Reps and BIM specifics can be found in the documentation (login required).
LabelUtilsPE is a protocol extension (PE) that moves label related functionality outside of core Teigha BIM functionality, allowing Teigha BIM member developers to implement their own protocol extension for support of different localizations. For now, a protocol extension with English labels is implemented as an example.