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13. Subscription and Aggregation with RS... > 13.4. Extending the Specification Th...

Extending the Specification Through Modules

When writing a specification, or a standard, the authors can take one of two approaches: they can try to capture the entire world encompassed by the specification, a process that can take years, or they can create a specification that has a minimal set of elements and provide a mechanism to allow for extensions. The RSS Working Group opted for the latter option—start small, and provide a carefully defined extension mechanism. For RSS, the extension mechanism is the module.

RSS modules are sets of elements that are delimited from other modules through use of XML namespaces. Different modules can have the same element, and both can be used in RSS without fear of collision as long as each module has its own namespace. The following is the namespace declaration for the Syndication module:


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