Structured Data Dashboard On Google Webmaster Tools

Last night, Google announced another cool data feature on Google Webmaster Tools - the Structured Data Dashboard!

This new tool, which is under the "Optimization" section of Google Webmaster Tools breaks out the structured data Google finds on your web site at three levels:

(1) Site Level

(2) Item Type Level

(3) Page level

Here is a picture of the video markup page level on this site:

Here is how Google describes each level of data:

• Site-level view: At the top level, the Structured Data Dashboard, which is under Optimization, aggregates this data (by root item type and vocabulary schema). Root item type means an item that is not an attribute of another on the same page. For example, the site below has about 2 million Schema.Org annotations for Books (“http://schema.org/Book”)
• Itemtype-level view: Google parses and stores a fixed number of pages for each site and item type. They are stored in decreasing order by the time in which they were crawled. We also keep all their structured data markup. For certain item types we also provide specialized preview columns as seen in this example below (e.g. “Name” is specific to schema.org Product).
• Page-level view: Google has a details page showing all attributes of every item type on the given page (as well as a link to the Rich Snippet testing tool for the page in question).

Forum discussion at Google+ & WebmasterWorld.