Evidence model

Sources and provenance

Milestone-one facts originate in the frozen sleeping-pad assertion dataset, which records source identity separately from normalized public values.

What public specification evidence includes

Expanded field evidence can show original manufacturer wording, normalized value, HTTPS manufacturer source, observed and retrieval dates, transformation, variant scope, and a whitelisted comparability projection: standard, edition, attribution, evidence scope, qualifying value-level ASTM status, and estimate status. Conflicts retain each public observation.

What it excludes

Internal operational notes and the raw assertion database are not serialized into interactive client bundles. Source links are evidence citations, not merchant or affiliate links.

Supplementary owner-feedback observations

The pilot dataset is separate from the frozen product-spec assertion model. It stores aggregate rating value, scale, review count, exact-model scope, brand product-page URL, label, state, and observation date only. It does not ingest review text, people, profiles, excerpts, or sentiment summaries.

HTTPS source policy

Only valid HTTPS source URLs may become clickable public citations. An unavailable or ineligible link does not erase the assertion state; it is shown as having no eligible public link.

State is part of the fact

Pending and Not published are explicit states, not zeroes. Ambiguous and conflicting evidence may remain readable without entering canonical filters, rankings, chart points, or difference claims.