iText is how we support multiple languages and media in prompt text and/or multiple choices.

Languages

To implement multiple languages, you need to define an <itext> element for each string you want to represent in more than one language.

<model>
  <itext>
    <translation lang="italian">
      <text id="hello">
        <value>this text would show when italian is selected</value>
      </text>
    </translation>

    <translation lang="english">
      <text id="hello">
        <value>this text would show when english is selected</value>
      </text>
    </translation>
  </itext>
    ...
</model>

Then to use those values in the form, simply reference the itext block in the body.

<input ref="languageQuestion">
   <label ref="jr:itext('hello')"/>
</input>

Media

To add media to prompts or multiple choice answers, use the same syntax for itext, but include the media in the itext definition.

<text id="robin">
 <value form="long">European robin</value>
 <value form="short">European robin</value>
 <value form="image">jr://images/robin.png</value>
 <value form="audio">jr://audio/european-robin.mp3</value>
</text>

The media files should be placed in /[external storage directory]/odk/forms/[formname]-media. For example, for the form birds.xml, the media would go into /sdcard/odk/forms/birds-media.