Joomla! Documentation™

Provides the use of a captcha plugin.

• type (mandatory) must be captcha.
• name (mandatory) is the unique name of the field.
• validate (mandatory optional ?) must be captcha.
• label (mandatory) (translatable) is the descriptive title of the field.
• description (optional) (translatable) is text that will be shown as a tooltip when the user moves the mouse over the drop-down box.
• namespace (optional) this is used on the com_contact component but I don't know enough about it to comment.

Example XML Definition:

<field name="captcha" type="captcha" validate="captcha"
	namespace="contact"
	label="COM_CONTACT_CAPTCHA_LABEL"
	description="COM_CONTACT_CAPTCHA_DESC" >
</field>