function Tileset3DTileContent(tileset, tile, resource) {
  this._tileset = tileset;
  this._tile = tile;
  this._resource = resource;

  this.featurePropertiesDirty = false;

  this._metadata = undefined;
  this._group = undefined;

  this._ready = false;
}
Represents content for a tile in a
{@link https://github.com/CesiumGS/3d-tiles/tree/main/specification|3D Tiles} tileset whose
content points to another 3D Tiles tileset.
<p>
Implements the {@link Cesium3DTileContent} interface.
</p>

@alias Tileset3DTileContent
@constructor

@private