In a SMIL document each media object must be included using a reference (URL) from src attribute. The src attribute is the most commonly media elements.

The type attribute is used to define the media type. If the type attribute is omitted the application should rely on the type information communicated by the server. Developers should not rely on the file type extension to define the file type.

The <animation> element defines a references to an animation object stored as vector graphics.

The <animation> element should not be confused with the <animate> element. The <animation> element defines an animation object by reference. The <animate> elements defines the animation of other elements.

This element defines a reference to an audio object stored as recorded audio.

Example:

This element defines a reference to an video object stored as recorded video.

Example: