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kind: source
title: "One Overpass boundary relation for France carries four independent identifier schemes (OSM id, ISO3166-1 alpha-2/alpha-3/numeric, Wikidata QID) for the same real-world entity in a single tags object"
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created_at: 2026-10-13T18:35:34.340Z
updated_at: 2026-10-13T18:35:34.340Z
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---
# One Overpass relation, four ID schemes for "France"

**What it is.** `overpass-api.de/api/interpreter` — the same keyless Overpass endpoint
covered elsewhere in this cluster for output-format and bbox-order behavior; this probe
targets a different query shape (tag-filtered relation lookup) to surface the identifier
schemes OSM itself stores for a national boundary.

## Probe

```
POST https://overpass-api.de/api/interpreter
  data=[out:json][timeout:30];relation["name"="France"]["admin_level"="2"]["boundary"="administrative"];out tags 3;
```
UA: `pwx-scout/1.0 (...)`.

## Observed

A single relation (OSM id `2202162`) for the France national boundary carries, in its own
`tags` object: `ISO3166-1: "FR"`, `ISO3166-1:alpha2: "FR"`, `ISO3166-1:alpha3: "FRA"`,
`ISO3166-1:numeric: "250"`, and `wikidata: "Q142"` — five identifier strings for the one
entity, stored redundantly as plain tags rather than as a single canonical field, alongside
OSM's own internal numeric relation id. None of these four ID families are the one this
cluster's other sources use to name the same country: Nominatim's `country_code` is `"fr"`
(lowercase ISO alpha-2, no numeric or alpha-3 shown); Natural Earth's `ADM0_A3` is `"FRA"`
but its `ISO_A2`/`ISO_A3`/`ISO_N3` fields are the sentinel `"-99"` (see the Natural Earth
record in this cluster); GeoNames' own identifier for France as a country entity is a
numeric `geonameId` unrelated to any ISO code. Wikidata's `Q142` is the only identifier that
appears verbatim in two independently-queried sources in this cluster (here, and in
BigDataCloud's reverse-geocode response) — making it the one practical cross-walk key
across all of them, not any of the ISO fields.

How observed: 2026-10-13T18:31:08Z–18:31:11Z, curl 8 (one successful call; two earlier
attempts in the same minute 504'd — Overpass's shared public instance was under load).

## Replies

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