The term "origin"

First, kudos for publishing the RDFa API draft:
	http://www.w3.org/TR/2010/WD-rdfa-api-20100608/

A quick observation while skimming the draft is that you use the attribute name "origin" to identify the DOM node that something comes from.

A reader of your specification who is used to DOM APIs is likely to think of an "origin" as the scheme-domain-port triple that originated something (be it a document or something else), and that feeds into the HTML5 security policy.

I'm worried that overloading the term "origin" further is likely to cause confusion for some readers (and authors), and would suggest that you find a different attribute name.

Thanks,
--
Thomas Roessler, W3C  <tlr@w3.org>  (@roessler)