Sequence Playlist

The sequential playlist is the simplest form of playlists in SMIL.

In a sequential playlist, media objects are played in the order they are listed in the SMIL playlist. One media object starts playing after the preceding one ends.

Simple loop

<seq repeatCount="indefinite">

    <video src="ad1.mpg" region="main"/>
    <video src="ad2.mpg" region="main"/>
    <img src="ad3.png" dur="5s" region="main"/>

</seq>

Loop 2 videos and 1 JPEG indefinitely.

Nested loop

<seq repeatCount="indefinite">

    <video src="ad1.mpg" region="main"/>

    <seq repeatCount="2">
        <video src="ad2.mpg" region="main"/>
        <img src="ad3.png" dur="5s" region="main"/>
    </seq>

</seq>

Plays the sequence: ad1, ad2, ad3, ad2, ad3 and repeats the entire sequence endlessly.

Source: a-smil.org