File

The File element is a container that represents a single audio file. It may be contained within a Package or Folder container.

The File element may contain many Block child containers.

A File element may also contain one OnStart, one OnFinish, and many OnButton event handlers.

Attribute	Description
ID	The ID of the container. Must be unique across all containers within the package.
Class	The type or resolution of content within this container. Possible values are "Chapter", "Page", "Sentence", etc..
Href	The path or url to the file containing the audio content