New versions of documents on structured data in HTML5

Posted on March 30, 2012 by Ivan Herman

The HTML5 Working Group has recently published ten documents,  updating a number of HTML5 related Working Drafts. From the Semantic Web perspective, two documents are of a particular interest:

  1. A new version of the “HTML+RDFa 1.1” specification. This version, developed by the RDF Web Applications Working Group, aligns RDFa 1.1 in HTML5 with the core RDFa 1.1 specification (currently in Candidate Recommendation phase). Note that the  RDFa 1.1 test harness includes HTML5+RDFa 1.1 tests, too, with a number of implementations already passing all the tests.
  2. A new version of the “HTML Microdata” specification. The important point to notice, again from the Semantic Web perspective, is the removal of the microdata→RDF algorithm (which appeared in earlier drafts but which has been rescinded since) in favor of the separate “Microdata to RDF” document that has been published recently, and which defines an updated and more RDF-friendly version of the mapping algorithm.

Those interested in structured data in HTML may also

be interested in the “HTML Data Guide” document, that details and compares the various approaches, or the “RDFa Lite 1.1 specification,” that provides a minimal, entry level subset of RDFa.

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About Ivan Herman

Ivan Herman is the Semantic Web Activity Lead at W3C. He graduated as a mathematician at the Eötvös Loránd University of Budapest, Hungary, in 1979. After a brief scholarship at the Université Paris VI he joined the Hungarian research institute in computer science (SZTAKI) where he worked for 6 years. He left Hungary in 1986 and, after a few years in industry, he joined the Centre for Mathematics and Computer Sciences (CWI) in Amsterdam where he has held a tenure position since 1988. He received a PhD degree in Computer Science in 1990 at the Leiden University, in the Netherlands. Ivan joined the W3C team as Head of Offices in January 2001 while maintaining his position at CWI. He served as Head of Offices until June 2006, when he was asked to take the Semantic Web Activity Lead position.

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