Independent This document defines the SDLP lineage model, which provides a canonical method for representing the ancestry of SDLP-governed objects. Lineage is a structural property that records how an object evolves through duplication and transformation events. The lineage model ensures that descendant objects remain uniquely identifiable and traceable across all lifecycle transitions. This specification defines the lineage grammar, extension rules, validation requirements, and interactions with the SDLP lifecycle model.