readExtentElement(node, objectStack) {
    const context = /** @type {Object} */ (objectStack[0]);
    const extent = /** @type {import("../extent.js").Extent} */ (
      this.readGeometryOrExtent(node, objectStack)
    );
    return extent ? transformExtentWithOptions(extent, context) : undefined;
  }
@param {Element} node Node.
@param {Array<*>} objectStack Object stack.
@return {import("../extent.js").Extent|undefined} Geometry.