Georeferencing API
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    Host-owned WMS layer eligible for reference acquisition.

    interface LeafletReference {
        id: string;
        layer: WMS;
        revision: string;
    }
    Index
    id: string

    Opaque layer identity selected through ReferenceSelection.layers.

    layer: WMS

    Borrowed L.tileLayer.wms layer; it need not be on a map and is never changed.

    revision: string

    Content/style revision; change it when data, filters, time or styling changes.