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 |





