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http://www.w3.org/WAI/PF/aria-implementation/#mapping_role If the element does not have a role attribute, or if the role attribute contains no tokens matching the name of a non-abstract WAI-ARIA role, the user agent MUST fall back on normal processing of the base markup for the element with the role attribute. For example, for <table role="log"> use the tag name "table" to determine what platform accessibility API role to use. For <input type="text" role="search">, use the platform accessibility API for a text input. The examples in this paragraph seem to imply that there is no 'log' or 'search' role, when in fact there are both. I'd suggest changing that to 'foo' and 'bar' or perhaps to use abstract roles.
Done.