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current data indicates 'not mapped' , but is incomplete http://rawgit.com/w3c/aria/master/html-aam/html-aam.html#att-rel prompted by q on twitter https://twitter.com/MikeRiethmuller/status/613559694695632896
HTML AAM is no longer an ARIA Deliverable. If you wish to pursue this issue please file at https://github.com/w3c/html-aam/issues