The outermost tag within a VoiceXML document.
| application | The URI of this document's application root document, if any. |
| xml:base | The base URI for this document. As in HTML, a URI that all relative references within the document take as their base. |
| xml:lang | (defaults to "en_us") Can be set to "en_us" or "fr_fr". |
| xmlns | (defaults to "http://www.w3.org/2001/vxml") The designated namespace for VoiceXML. This attribute is disregarded by the platform. |
| version | The version of VoiceXML of this document (required). Only "2.0" is supported, though certain "1.0" tags are still processed. |
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<catch>, <data>, <help>, <noinput>, <nomatch>, <error>, <form>, <link>, <menu>, <metadata>, <property>, <script>, <var>
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