2018-03-13 UTC
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Zegnat I agree it is ambiguous on the replacing part. The mf2 spec however says “parse the element for the value-class-pattern, including the date and time parsing rules”, which makes me think dt-* should adhere to the basic spec and not by default overwrite. And according to the basic vcp rules, the “date and time parsing rules” that have to be included only apply when multiple value elements are found.