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

    interface OpenLayersReference {
        id: string;
        layer: BaseLayer;
        revision: string;
    }
    Index
    id: string

    Opaque layer identity selected through ReferenceSelection.layers.

    layer: BaseLayer

    Borrowed ImageWMS/TileWMS layer or loaded vector layer; never disposed by the provider.

    revision: string

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