RFC 3625, "The QCP File Format and Media Types for Speech Data", September 2003

Errata ID: 249
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Richard Walters
Date Reported: 2005-08-30

Section 3 says:

    VRAT            = %x76 %x72 %x61 %x74

Notes:

This rule is important because without it, it isn't clear whether the
"vrat" string is capitalized (like "RIFF" and "QLCM") or not (like
"fmt " and "data").

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