[carlbarrdahl]

What if there was a kind of search engine with support for all these schemas? An open platform for interfacing with websites supporting this structued data.

I know Google supports some of them (Product, Recipe, Article, etc...). This would support all of them as well as a way to push Actions (eg, OrderAction to order food from a restaurang)

Websites would expose json+ld data instead of html and clients could decide how these responses would render and interact with.

Does anything like this exist?

[aarroyoc]

Something related but executed locally: https://comunica.linkeddatafragments.org/

[mindcrime]

Not sure if it still works or not, but there used to be a search engine specifically for Semantic Web data at:

http://swoogle.umbc.edu/2006/

The site is still up, but I remember trying it a while back and getting a lot of errors, so not sure if it's in a usable state or not.