The current HTML5 CR has a "Note" about the article element [1] (it’s also in HTML 5.1 Nightly [2]):

> The schema.org microdata vocabulary can be used to provide the publication date for an article element, using one of the CreativeWork subtypes.

I’m not sure how useful it is in the first place to reference Schema.org (as it just happens to be a popular vocabulary currently, but this may change), but in case this info is kept, it should be edited:

Schema.org is a vocabulary that can be used with Microdata, but it’s not exclusively a "microdata vocabulary": It can be used with RDFa, JSON-LD, and whatnot to come. In fact, the "canonical machine representation" [3] of the vocabulary is in RDFa [4].

So it should say something like:

> The schema.org vocabulary can be used to […]

Other things to consider (but these should probably get their own issue, I assume):

* Why not add a link to <http://schema.org/>, and/or "CreativeWork"?
* Why not name/link the actual propety in question, datePublished [5]?
* Shouldn’t the whole Info be rephrased, so that it references schema.org only as a possible example of many vocabularies?

[1] http://www.w3.org/TR/2014/CR-html5-20140731/sections.html#the-article-element
[2] http://www.w3.org/html/wg/drafts/html/master/sections.html#the-article-element
[3] http://schema.org/docs/datamodel.html
[4] http://schema.org/docs/schema_org_rdfa.html
[5] http://schema.org/datePublished