function bbox(geometryName, extent, srsName) {
  return new Bbox(geometryName, extent, srsName);
}
Create a `<BBOX>` operator to test whether a geometry-valued property
intersects a fixed bounding box

@param {!string} geometryName Geometry name to use.
@param {!import("../extent.js").Extent} extent Extent.
@param {string} [srsName] SRS name. No srsName attribute will be
   set on geometries when this is not provided.
@return {!Bbox} `<BBOX>` operator.
@api