json-schema/json-schema — pull request #11 by geraintluff (2012-09-04 18:00:11+00:00)
Title: Two proposed properties for the Link Description element

#### mimeType
This describes the expected (but not guaranteed) MIME type of the link's target. Link elements in HTML, and the "Link" header in HTTP already have an equivalent field, called "type", so I believe there is precedent.

#### invalidates
The idea of this one is that you can specify a list of URIs that should be declared out-of-date if you visited the link. "Invalidated" means they should be removed from any local cache, and be re-fetched (using an appropriate protocol) if they are needed.

For example, you follow a link that deletes a resource, then other resources referring to that resources (for instance search results, or a directory listing) should also be updated.

URLs in this property are filled out using the same templating scheme as used for "href".