The owner of a Yadis identifier can choose which services he wishes to use in his XRDS document.
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Yadis then associates an XRDS document (an XML-based capability file) with each URL that expresses the associated capabilities or services.
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This descriptor follows the XRDS format and connects several services, like authentication or authorization to the Yadis URL.
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However, Yadis is an open initiative, so other developers will start using XRDS lightweight capabilities description, making possible a "mix and match" approach to building Yadis-enabled applications, enabling application developers to choose their own balance between ease of implementation on one hand, and range of features on the other.