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This document is currently under active development. Its latest version can always be found here. See the ulx:Change History at the end of this document for its revision number.


  1. Supports a login process that is either triggered by embedded object/markup or triggered by the user clicking on a button
  2. Has common semantics irrespective of the option used in #1 above
  3. Supports id-enabled browsers as well as passive (unmodified) browsers
  4. If it is necessary to embed the RP metadata itself the RP metadata should be base 64 encoded
  5. Supports attribute aggregation
  6. Supports attribute mapping
  7. Supports value-basd based filtering (e.g. asking for a claim for a particular monetary amount)