Access to Open Graph tags, etc?

It would be exceedingly useful if the Web Clipper offered access to categories of available source information from a webpage: the DOM, Open Graph (see ogp dot me) and metatags, or information from the current URL itself (i.e. to extract categories for RESTful URLs that have a common pattern (i.e. /photos or /users).

For starters, it’d be very useful to access metatags like:

og:title
og:description
og:url
og:type
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