====== DNSDomainRule ======

Input validation rule that tests for a valid domain name with a valid DNS "A" record.  If DNS services are unavailable data will not be considered invalid, possibly preventing data entry when connectivity is bad.

===== Example =====

<code php>
$form->addRule (new DNSDomainRule ('fieldName'));
</code>

This example will check that the value in the field named "fieldName" has a valid DNS "A" record.

===== Additional Information =====

  * [[DomainRule]]
  * [[wact:api:validation:rule:catalog|Validation Rules]]
  * WACT [[wact:Form Validation]]