SEStructEvidence

Timeline Model

Dynamics

R1.1 separates structural Level from structural Delta so a dated snapshot can describe condition without implying trend.

R1.1 Method Boundary

Structural Level describes what the dimension condition is at a dated observation. Structural Delta describes how it changed only when a valid comparable prior observation or explicit change event exists. A single structural snapshot can establish a Level, but usually cannot establish a Delta.

TIMELINE_MODEL_R1_1ATIMELINE_UI_R1_1ARDL FRESHNESS POLICY NOT_CONFIGURED

Process Concepts

ConceptMeaning
Atomic ObservationA dated observation derived from frozen artifacts, with effective_at and known_at kept separate.
Level StateThe observed structural condition; not a quality label or score.
Delta StateDirection of change relative to a valid comparable prior state, or an explicit change event.
Prior Comparable SelectionRequires same subject, dimension, measurement concept, compatible method, and earlier effective_at.
DAY to WEEK to MONTHExecutable aggregation lineage; MONTH resolves to WEEK, DAY, atomic observations and artifacts.
No Look-AheadEvidence cannot appear before its known_at date.
Sparse Data RuleOne dated point is rendered as a sparse point, not a continuous history.
Level Age vs Delta AgeAge is descriptive metadata; unestablished Delta has no Delta age.
Future RDL Freshness OverlayAge fields exist for later policy, but no thresholds are configured.