# Data dictionary

Version 1.0. Generated by `build.py` from `dictionary.py` — do not hand-edit.

Every column in both tables, with its type, unit and meaning. The machine-readable form of this file is [`data-dictionary.csv`](../data-dictionary.csv); the same definitions render the dataset card's field table and the Hub's dtype declarations, so the three cannot disagree.

## `containers` → `containers.csv`
36 columns.

| Column | Type | Unit | Description |
|---|---|---|---|
| `id` | string | — | Stable slug, e.g. `euro-600x400x230`, `alc-600x400x310`, `vda-rklt-6429` |
| `type` | string | — | `euro_stacking_container` · `attached_lid_container` · `vda_klt_container` |
| `type_label` | string | — | Human-readable form of `type` |
| `common_names` | string | — | Semicolon-separated search terms, ordered most standard to most colloquial, including regional ones (`Eurobehälter`, `bac gerbable`) and genericised vendor names (`Hudson box`). Search terms only — never discriminate families on them, see `guidance/naming.md` |
| `external_length_cm` | float64 | cm | External length |
| `external_width_cm` | float64 | cm | External width |
| `external_height_cm` | float64 | cm | External height |
| `external_length_in` | float64 | in | External length in inches. Always the derived side on this table — these nominal sizes are fixed in millimetres by the standards |
| `external_width_in` | float64 | in | External width in inches, derived |
| `external_height_in` | float64 | in | External height in inches, derived |
| `external_volume_l` | float64 | L | L × W × H. **Not** what the box holds |
| `external_volume_gal` | float64 | US gal | External volume in US liquid gallons |
| `internal_length_cm` | float64 | cm | Typical internal length. Populated for every Euro row and for the two KLT sizes a vendor publishes; empty for ALCs, whose taper makes a single internal dimension meaningless |
| `internal_width_cm` | float64 | cm | Typical internal width, same basis |
| `internal_height_cm` | float64 | cm | Typical internal height, same basis |
| `internal_length_in` | float64 | in | Typical internal length in inches, derived |
| `internal_width_in` | float64 | in | Typical internal width in inches, derived |
| `internal_height_in` | float64 | in | Typical internal height in inches, derived |
| `internal_dims_basis` | string | — | Where those internal figures came from: `vendor_average_rule`, `vendor_published`, `not_published`, `not_published_tapered_walls` |
| `internal_dims_vendors` | int64 | — | How many **vendors** publish internal dimensions for this footprint. Vendors, not listings — one mould in five colours is one opinion |
| `typical_capacity_l` | float64 | L | **The usable number.** Always populated |
| `typical_capacity_gal` | float64 | US gal | Usable capacity in US liquid gallons |
| `vendor_capacity_low_l` | float64 | L | Capacity implied by the least generous vendor's own published internal dimensions for this footprint. Empty where no vendor publishes any |
| `vendor_capacity_high_l` | float64 | L | As above, most generous vendor. See `guidance/internal-dimensions.md` |
| `usable_ratio` | float64 | — | `typical_capacity_l / external_volume_l` |
| `capacity_basis` | string | — | How the capacity was arrived at: `derived_from_internal_dims`, `vendor_nominal`, `published`, `derived_from_klt_ratio` |
| `lidded` | bool | — | True where a lid is integral to the product (ALCs) |
| `lid_available_separately` | bool | — | True where a lid exists but is a separate purchase |
| `nestable_when_empty` | bool | — | True for ALCs; straight-walled boxes stack but do not nest |
| `typical_nesting_ratio` | float64 | — | Fraction of its own height a nested empty box saves. 0.75 for ALCs, **0 for everything else** — that is a fact about a straight-walled box, not missing data |
| `standard_conformant` | bool | — | Whether the footprint conforms to a recognised module |
| `standard` | string | — | Which one, stated precisely |
| `vda_4500_height` | bool | — | Whether the external height is on the VDA KLT grid (147.5 / 213 / 280 mm) |
| `eur1_pallet_per_layer` | int64 | — | Boxes per layer on a 1200 × 800 Euro pallet, no overhang. The one column that reaches past the box itself — see Scope |
| `listings_observed` | int64 | — | How many rows in the `listings` table back this size — 0 means the row is a plausible interpolation, not something seen for sale |
| `notes` | string | — | Per-row caveats. Read these |

## `listings` → `listings.csv`
32 columns.

| Column | Type | Unit | Description |
|---|---|---|---|
| `listing_id` | string | — | Stable slug, `<vendor>-<sku or handle>` |
| `vendor` | string | — | Salesbridges · Plastic Box Shop · Yosibox · Hudson Exchange |
| `vendor_country` | string | — | ISO 3166-1 alpha-2 of the vendor's market |
| `product_name` | string | — | The vendor's own product title, verbatim |
| `sku` | string | — | Vendor SKU where published, else empty |
| `url` | string | — | The listing, as captured on `captured_date` |
| `type` | string | — | Family, assigned by this project — not the vendor's word |
| `native_unit` | string | — | `metric` or `imperial`: which unit the vendor's own catalogue publishes in, and therefore which dimension columns are the figure and which are the conversion. See `guidance/units-and-us-vendors.md` |
| `external_length_cm` | float64 | cm | External length as listed or converted |
| `external_width_cm` | float64 | cm | External width as listed or converted |
| `external_height_cm` | float64 | cm | External height as listed or converted |
| `external_length_in` | float64 | in | External length; the vendor's own figure where `native_unit` is `imperial` |
| `external_width_in` | float64 | in | External width, same basis |
| `external_height_in` | float64 | in | External height, same basis |
| `internal_length_cm` | float64 | cm | Internal length **as the vendor publishes it**, empty where they do not. 95 of 121 rows carry these; vendors measure at different heights on a tapered box, which is why the typical table's figures are conservative |
| `internal_width_cm` | float64 | cm | Internal width as published |
| `internal_height_cm` | float64 | cm | Internal height as published |
| `internal_length_in` | float64 | in | Internal length in inches |
| `internal_width_in` | float64 | in | Internal width in inches |
| `internal_height_in` | float64 | in | Internal height in inches |
| `stated_capacity_l` | float64 | L | The vendor's own capacity claim. Not recomputed — the point of this table is what they say |
| `stated_capacity_gal` | float64 | US gal | The same in US gallons; the vendor's own figure for Hudson Exchange |
| `external_volume_l` | float64 | L | L × W × H, computed here |
| `external_volume_gal` | float64 | US gal | The same in US gallons |
| `usable_ratio` | float64 | — | `stated_capacity_l / external_volume_l` — what **this** vendor claims, not what the typical table concluded |
| `price` | float64 | — | As captured, in `currency`. An observation with a date on it, not a price feed |
| `currency` | string | — | ISO 4217 |
| `price_includes_vat` | bool | — | Whether the captured price is VAT-inclusive. Differs by market — UK and NL retail inclusive, US exclusive |
| `pack_quantity` | int64 | — | Units in the pack the price refers to. Multipacks and pallet deals are common |
| `unit_price` | float64 | — | `price / pack_quantity` |
| `captured_date` | string | — | ISO 8601 date the listing was read |
| `notes` | string | — | Per-row caveats, including non-conforming footprints |