Class LadesaeulenClient

The number of stations matching the query (returnCountOnly): every match of where and near. A limit, offset, orderBy or outFields is a LadesaeulenValidationError (countQueryProblem), since ArcGIS ignores them on a count and would return the full total, not a per-page count.

Grouped station counts by one field (ArcGIS outStatistics group-by), e.g. countBy("state") for stations per Bundesland. Sorted descending by count. The field name is trimmed; a comma-separated list is a LadesaeulenValidationError.

Like countBy, plus the server's exceededTransferLimit: true when the list was cut at the server's ~2000-group cap (the largest groups are still all there, since the server sorts by count first).

The layer's field metadata (names/types/aliases) — for building queries.

The matching stations as a GeoJSON FeatureCollection (f=geojson); limit defaults to DEFAULT_LIMIT. The reply must be a FeatureCollection whose features is an array of JSON objects; anything else (a gateway's {}, features: null, a string) is a LadesaeulenParseError, never an empty map.

How current the register is, from the layer's own metadata: the layer name and its editingInfo dates as ISO 8601 strings (lastEditDate, dataLastEditDate; null when the server sends none). No row carries an as-of date (documentDate is always empty), so this is the date to cite with an answer. One request, like fields().

A page of charging stations (ArcGIS f=json); limit defaults to DEFAULT_LIMIT.