"Really Simple Syndication" or "RDF Site Summary" is a means of providing timely and concise summaries of site content specifically for subscribers to that information.
The $$RSS$$ directive allows the equivalent of a $$SYNOPSIS$$ or $$BLOG$$ summary to be provided as an RSS feed. "What's New?" uses blog entries and an $$RSS$$ directive to provide a feed of the latest enhancements to VWcms. "What's Changed?" provides a list of the more to less recent changes to all sections of the VWcms documentation.
VWcms RSS feeds are identified by a string and so each site can support multiple feeds with differing information contents.
Using the $$RSS$$ directive with the feed and subscribe parameter provides a subscription link.
provides the subscription link seen in the What's New? section.
The subscribe parameter takes an optional string providing an alternate subscription description or image.
$$RSS$feed=another$subscribe=Subscribe to "Another" Feed!$$
The feed is under the control of the site. The only parameter provided by the client is the feed name. If a feed by this name is not found the client receives an appropriate error. Feed parameters are provided by site content. An $$RSS$$ directive on the first line of any section (page) in the site (but obviously better placed in association with the feed content itself) provides those parameters. It must consist of a leading, identifying feed name, then a feed type (synopsis or blog) and then any relevant parameters available with the $$SYNOPSIS$$ or $$BLOG$$ directives.
The What's New? section has an RSS feed specified as
$$RSS$feed=whatsnew$type=blog$description=What's new with VWcms!$level=-1$$
which provides immediately subordinate blog (dated) entries.
The What's Changed? section has a feed specified as
$$RSS$feed=whatschanged$type=synopsis$description=What's changed in the VWcms documentation!$level=1$order=-$since=*$$
which provides all sections in the VWcms documentation listed most to least recently modified.
The following parameters provide additional information to an RSS feed.
An additional and optional feature that may be provided is a validate feed link.
The validate parameter takes an optional string providing an alternate description or image.
$$RSS$feed=another$validate=Validate "Another" Feed!$$
By default the W3C validator is used however an additional parameter
can be supplied to specify another service (note the "%s" that includes the feed URL at the appropriate point in the validator URL).