A self-contained C++ class representing rational time (value + rate) with arithmetic, comparison, timecode conversion (SMPTE ST 12-1:2014), and rescaling. It is independent of the rest of OTIO and can be reused in any media or audio application that needs precise time handling. Demonstrates clean design with operator overloading, epsilon-based floating point comparison, and efficient frame rate handling.

Implements a central registry for serializable types with versioned schemas, upgrade/downgrade functions, and alias support. This pattern enables forward and backward compatibility of serialized data. While coupled to OTIO's SerializableObject hierarchy, the registry pattern itself is reusable for any versioned serialization system. The code demonstrates careful handling of type registration, version mapping, and function dispatch.

A Python module that discovers and loads plugin manifests from entry points, environment variables, and installed packages. It supports multiple plugin types (adapters, media linkers, hook scripts, schemadefs) with deduplication and ordering. The manifest loading logic is generic and could be extracted to build extensible applications with plugin discovery. It demonstrates clean separation of concerns and robust error handling.