Modular Architecture
Yadis follows the REST-ful, "small pieces loosely joined" paradigm that has proven to be successful in the development of the web.
The basic assumption is that identities can be addressed with URLs or with other identifiers (such as XRI i-names) that can be resolved to URLs. Yadis then associates an XRDS document (an XML-based capability file) with each URL that expresses the associated capabilities or services.
The owner of a Yadis identifier can choose which services he wishes to use in his XRDS document. After retrieving this document, a relying party such as a website accepting Yadis identifiers can select an appropriate services of the XRDS document, e.g. a protocol to use for authentication. This can allow existing web sites, like blogs, to easily implement basic Yadis functionality (for instance, redirecting users who arrive at a blog to relevant information about the person the blog belongs to) while also making it possible to build more advanced applications (for example, allowing complex queries of a site-owner's information to be submitted directly to the Yadis site).
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