Yeah, I don't see how to use <data> semantically at all. Even if it's within a microformat itemscope (which isn't required), there doesn't seem to be a standard way for the user agent to get a schema for the itemtype which would tell it that, e.g., <data class="dtstart"> contains a date. For an HTML standard, they're wasting too much time on features that can only be useful in a client/server hell of document-specific js everywhere.
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Yeah, I don't see how to use <data> semantically at all. Even if it's within a microformat itemscope (which isn't required), there doesn't seem to be a standard way for the user agent to get a schema for the itemtype which would tell it that, e.g., <data class="dtstart"> contains a date. For an HTML standard, they're wasting too much time on features that can only be useful in a client/server hell of document-specific js everywhere.