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13. Subscription and Aggregation with RS... > 13.3. A Detailed Look at the Specifi...

A Detailed Look at the Specification

RSS is first and foremost valid RDF, requiring the enclosing RDF element. Other RSS-specific elements that are required are channel, title, link, and one or more item elements. The remaining RSS elements are optional.

Tip

The RSS RDFS can be found at http://web.resource.org/rss/1.0/schema.rdf/. Examining this, you’ll see that many of the RSS properties discussed in this section are actually subproperties of related DC properties, such as TITLE, URL, DESCRIPTION, and so on.

Certain allowable features of RDF are restricted within RSS, primarily to simplify the tool builder’s task. For instance, at the time of this writing, repeating properties (or subelements as they are termed in the RSS spec), which are allowed in RDF, are restricted in RSS. This restriction means that you couldn’t list multiple subelements of the higher-level item element, such as multiple DC subject entries (which would be a naturally occurring repetitive element). However, the RSS Working Group is working toward removing this restriction or at least having each RSS module writer explicitly specify where repeating properties are allowed.


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