Introduce UPDL as an evolving description system for shared platform structures.
UPDL is the repository's evolving description language for shared structures, portable definitions, and future cross-stack modeling workflows.
In the current platform direction, it is best treated as a broader language layer for describing entities, relations, behaviors, and exportable structures.
Node Families
Space Nodes define bounded contexts and structural containers.
Entity Nodes describe business or content objects.
Component Nodes attach reusable capabilities or fields.
Action Nodes express operations and state transitions.
Event Nodes express triggers and reactions.
Data Nodes carry values, mappings, and typed payloads.
The node family pages below describe the role of each category in that broader direction.