# Interior Measurement Conversion Reference: dictionary

- `id`: Stable example identifier.
- `context`: Labelled example and input units; not a surveyed object.
- `operation`: Whitelisted arithmetic operation.
- `inputs`: Ordered numeric inputs, in the units named by context/formula.
- `unit`: Unit of the result, never a rate or currency.
- `limitation`: Record-specific interpretation boundary.
- `result`: Calculated output, not an observation.
- `formula`: Human-readable formula with input units.
- `evidence_grade`: D: transparent derivation; not first-hand measurement.
- `claim_type`: transparent_calculation.
- `source_url`: Authority for units, not furniture recommendations.
- `reviewed_at`: Source/annotation review date.