OptionalextensionThe key of the file. Must be unique within the Loader.
OptionalsceneIf this plugin is to be added to the Scene, this is the property key for it.
OptionalsystemIf this plugin is to be added to Scene.Systems, this is the property key for it.
OptionalurlThe absolute or relative URL to load the file from. Or, a Scene Plugin.
OptionalxhrExtra XHR Settings specifically for this file.
The default file extension to use if no url is provided.