UnAPI

According to its website, an unAPI is:

a tiny HTTP API any web application may use to co-publish discretely identified objects in both HTML pages and disparate bare object formats. It consists of three parts: an identifier microformat, an HTML autodiscovery link, and three HTTP interface functions, two of which have a standardized response format.

The unAPI specification is only two pages long.[1]

  1. ^ Cite error: The named reference Ariadne_2006 was invoked but never defined (see the help page).