This lets us for example exclude all features that are at a too high level (e.g. country or continent) by explicitly specifying all the layers that we care about and only getting results from those layers.
Try it live:
The list of all layer is as follows:
Knowledge of this list is useful if we only want to exclude particular layers since the features database doesn't have a concept of layer hierarchy at this point. A description of the layers can be found in the Who's on First documentation.
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