RSS is a method of publishing web information in a way that can be picked up by subscribers. This allows specialized readers to summarize web content for reading.
The way that this works is that an XML-formatted file is identified and provided, which contains the content and its description. RSS readers can then look for that file and load it when necessary, such as when it has been modified.
In Moodle, the common way to distribute content via RSS is by providing a [module name]_rss_feeds
function in a /mod/rsslib.php
file. This gets called by the main cron job on a regular basis in order to distribute what the module identifies.
The assignment module does not currently provide a way to do this however, and so assignment types cannot automatically publish their own feeds. Instead, we will publish a new feed when a posting has been made.