CableLabs CableLabs This document defines the core vocabulary and extension model used by Privacy Preference Declarations (PPDs) to describe data handling in home networks. It complements [I-D.draft-dsmullen-ppd-architecture] and [I-D.draft-dsmullen-ppd-protocol] by standardizing term spaces for data types, purposes, actions, sources, destinations, and selected constraints. Stable term identifiers are the primary semantic hook. Baseline participant-facing protocol messages use compact identifiers plus taxonomy context rather than requiring full ontology exchange on the wire.