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The layout of the screen is defined in the global header section of SMIL document. 

== Layout ==

Within the <code><head></code> node, one can use the <code><layout></code> tag to define screen regions. 

<source lang="smil">
<smil>
  <head>
    <layout>
      <!-- Global layout definition here -->
    </layout>
  </head>
  <body>
    <!-- Contents here -->
  </body>
</smil>
</source>

== Global resolution ==

The <code><root-layout></code> tag defines the width and height of the display area. For digital signage, this is the logical resolution of the entire screen area.

<source lang="smil">
<layout>
  <root-layout width="1280" height="720" />
</layout>
</source>

== Region ==

The <code><region></code> tag defines an area over the entire display zone where individual media items can be assigned to play.

<source lang="smil">
<layout>
  <root-layout width="1280" height="720" />
  <region regionName="video" top="0" left="0" width="720" height="480" z-index="1" />
  <region regionName="ticker" top="480" left="0" width="1280" height="240" z-index="1" />
  <region regionName="slideshow" top="0" left="720" width="560" height="480" z-index="1" />
  <region regionName="overlay" top="50" left="50" width="100" height="100" z-index="2" />
</layout>
</source>

The <code><head></code> section defines a typical 3-zone digital signage application with a zone for 720x480 video, a slide show zone, and a ticker zone. Overlaying the video zone is an overlay layer which allows the user to place a logo or a dynamic message on-top of the running video.

The user can then [[Assigning region|assign]] each media objects to a region.

There are several [[Fit options]] which you can apply to a region or a media object to resize the content.

== Related ==
SMIL topics:
* [[SMIL Media Objects]]: video, image, smilText, and audio objects
* [[SMIL Playlists]]: seq, par, and excl playlists
* [[Transport|Sending SMIL to Player]]

Layout topics:
* [[Assigning region|Assigning]] media objects to a region