HTML+RDFa 1.1 - @datetime attribute clarification

1. Is the @datetime only to be processed on the 'time' element?  If so, it
needs to say that.

2. You all should add a reference to the spec [1].

3. Is it the case that there is a deterministic algorithm for property
detecting the type from the possible set of values and non-values?

[1] http://www.w3.org/TR/html5/text-level-semantics.html#the-time-element

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics