The Routing API returns a top-level element,
CalculateIsolineResponse, as the answer to a
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Provides details about the request itself, such as the time at which it was processed, a request id, or the map version on which the calculation was based.
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Center of the resulting isolines. The center is the coordinate representation in the routing network of the start or destination waypoint defined in the request. This is supported only if the Start/Destination in a request is defined by GeoWaypointType or one LinkID. Otherwise 0 (zero) is returned. This parameter is deprecated, please use start and destination instead.