20260923-0 RDFa RDFa RDFa RDFa 2016-02-10 2006-03-10 RDFA 2016-03-02 2016-02-16 Resource Description Framework in Attributes RDFa is a technique that provides a set of markup attributes to augment the visual information on the Web with machine-readable hints. application/rdfa .rdfa RDFA false RDFA 2006-03-10 RDFA true true https://www.iana.org/assignments/media-types/application/xhtml+xml