# \<sub>

## \<sub> <a href="#sub" id="sub"></a>

`<sub>` tags suggest substitute text to the TTS engine. This tag is only available with the Cepstral Theta TTS engine.

### Attributes

<table><thead><tr><th width="133.33333333333331">Name</th><th width="166">Data type<select><option value="a4b46b0bcde745c195360c57600e432f" label="String" color="blue"></option><option value="3150ce0d433644f8b57c65660f482874" label="Integer" color="blue"></option><option value="20d77c0a5a7f4e78994da30238687a88" label="Boolean" color="blue"></option></select></th><th>Description</th></tr></thead><tbody><tr><td>alias</td><td><span data-option="a4b46b0bcde745c195360c57600e432f">String</span></td><td>Substitutes the enclosed text with the specified value.</td></tr></tbody></table>

### Notes

None

### Example

```markup
<?xml version="1.0" encoding="latin-1"?>
<vxml version="2.0">
  <form>
    <block>
      <prompt>
        This dialog is being processed by
        <sub alias="Plum DEV">
          plum D E V
        </sub>
      </prompt>
    </block>
  </form>
</vxml>
```

The output of the above script would be:

> Computer: This dialog is being processed by Plum DEV.

### Child Tags

None

### Parent Tags

[\<audio>](https://docs.plumvoice.com/dev/voicexml/tags/audio-tag), [\<emphasis>](https://docs.plumvoice.com/dev/voicexml/tags/emphasis-tag), [\<enumerate>](https://docs.plumvoice.com/dev/voicexml/tags/enumerate-tag), [\<foreach>](https://docs.plumvoice.com/dev/voicexml/tags/foreach-tag), [\<paragraph>](https://docs.plumvoice.com/dev/voicexml/tags/paragraph-tag), [\<prompt>](https://docs.plumvoice.com/dev/voicexml/tags/prompt-tag), [\<prosody>](https://docs.plumvoice.com/dev/voicexml/tags/prosody-tag), [\<sentence>](https://docs.plumvoice.com/dev/voicexml/tags/sentence-tag), [\<speak>](https://docs.plumvoice.com/dev/voicexml/tags/speak-tag), [\<voice>](https://docs.plumvoice.com/dev/voicexml/tags/voice-tag)