Commonly used schemas ('Classes' in OOP terminology) for production

Here is a list of the most used production schemas with a short explanation of what the schema provides:

• Typed:
  • UsdGeom.Imageable: Purpose, Visibility, Bounding Box
    • UsdGeom
      • UsdGeom.PointInstancer: PointInstancers
      • UsdGeom.PointBased:
        • UsdGeom.Mesh: Polygon Meshes
        • UsdGeom.Points: Points
        • UsdGeom.Curves: Curves
      • UsdVol.Volume: Volumes
        • UsdVol.OpenVDBAsset: VDB Volumes
      • UsdGeom.Xformable: Transforms
      • UsdGeom.Boundable: Extents
      • UsdGeom.Camera: Camera Attributes, Access to Gf.Camera
• API:
  • Usd.ModeAPI: Asset info, Kind
  • UsdGeom.ModelAPI: Draw Mode, ExtentHint
  • Usd.ClipsAPI: Value Clips (Metadata for per frame caches)
  • Usd.CollectionAPI: Collections
  • Usd.PrimvarsAPI: Primvars Attributes
  • UsdGeom.XformCommonAPI: Simplified transforms
  • Usd.VisibilityAPI (Beta): Visibility per purpose
  • UsdSkel.BindingAPI: Skeleton bindings
  • UsdShade.ConnectableAPI: Shader connections
  • UsdShade.CoordSysAPI: Coordinate spaces for shaders
• Graphics Foundations (Gf):
  • Gf.Camera: Camera
  • Gf.Frustum: Frustum