Hey,

This seems to be the homepage for the "REST API": https://www.mediawiki.org/wiki/Wikimedia_REST_API

but I don't see any documentation there for API parameters.

For example, someone gave me this example API call: https://en.wikisource.org/api/rest_v1/page/html/Little_Essays_of_Love_and_Virtue 

But I don't see information in the first link above that you should append "page" and "html" to the wikisource API endpoint.

Is there documentation for this API?

Also, is this API an attempt to replace the old one or something? How does it differ from the MediaWiki Action API and the MediaWiki REST API?

For example, do they fetch different kinds of information or something? 

Also, would the "parse" prop in the Action API be a good way to get plaintext from a Wikisource book?

Thank you,
Julius