### Overpass API Query Result Structure

Source: https://github.com/project/overpass_api/blob/1.0.x/README.md

This is an example of the expected array structure for OSM elements returned by an Overpass API query.

```text
array:216 [
  0 => {
    "type": "relation"
    "id": 60189
    "members": [...]
    "tags": {...}
  }
  ...
]
```

--------------------------------

### Query Overpass API

Source: https://github.com/project/overpass_api/blob/1.0.x/README.md

Use this snippet to query the Overpass API service. It handles potential timeout and fatal errors by retrying queries. Ensure the Overpass API service is configured in Drupal.

```php
$result = \Drupal::service('overpass_api')->query(<<<EOT
relation
  ["admin_level"="2"]
  ["type"="boundary"]
  ["boundary"="administrative"]
  ["ISO3166-1:alpha2"~"^..$"]
EOT);
```

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