> For the complete documentation index, see [llms.txt](https://docs.plumvoice.com/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plumvoice.com/dev/voicexml/tags/one-of-tag.md).

# \<one-of>

## \<one-of> <a href="#one-of" id="one-of"></a>

A `<one-of>` block specifies a set of alternative legal rule expansions each of which is contained within an `<item>` block.

### Attributes

<table><thead><tr><th width="158.33333333333331">Name</th><th width="152">Data type<select><option value="3eaf261d7f994626817febda5aae2c60" label="String" color="blue"></option><option value="9117dc4f443a428fbd34730fe1200a24" label="Integer" color="blue"></option><option value="685a016a908c4273a224b77f7508e255" label="Boolean" color="blue"></option></select></th><th>Description</th></tr></thead><tbody><tr><td>xml:lang</td><td><span data-option="3eaf261d7f994626817febda5aae2c60">String</span></td><td>(defaults to “xml:lang” global property or the “xml:lang” attribute of the &#x3C;grammar> tag) The language identifier as defined in <a href="http://www.ietf.org/rfc/rfc3066.txt">RFC3066</a>.</td></tr></tbody></table>

### Notes

For examples and usage information, please refer to the [Speech Recognition Grammar Specification](http://www.w3.org/TR/2002/CR-speech-grammar-20020626/).

### Example

```markup
<?xml version="1.0"?>
<vxml version="2.0">
  <form>
    <field name="animal">
      <grammar type="application/srgs+xml" root="ROOT" mode="voice">
        <rule id="ROOT">
          <one-of>
            <item>Dog</item>
            <item>Cat</item>
          </one-of>
        </rule>
      </grammar>
      <prompt>
        Say either dog or cat.
      </prompt>
      <filled>
        <prompt>
          You said <value expr="animal"/>. Goodbye.
        </prompt>
        <exit/>
      </filled>
    </field>
  </form>
</vxml>
```

The output of the above script would be:

> Computer: Say either dog or cat.\
> Human: Dog.\
> Computer: You said dog. Goodbye.

### Child Tags

[\<item>](/dev/voicexml/tags/item-tag.md)

### Parent Tags

[\<item>](/dev/voicexml/tags/item-tag.md), [\<rule>](/dev/voicexml/tags/rule-tag.md)