Re: VoiceXML 2.1: VoiceXML 2.0 support

* Matt Oshry wrote:
>VoiceXML 2.1 implementations are not required to support documents with
>the version attribute of the <vxml> element set to the value '2.0'.
>VoiceXML 2.1 implementations are only required to support documents with
>the version attribute of the <vxml> element set to the value '2.1'.

The issue I raised was concerned with why they are not required to. Why?
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