fairly experimental parser for HTML 'microdata'

 Resource Description Framework (RDF) is a standard model for data
 interchange on the Web.
 .
 Microdata is an experimental metadata format, not in wide use, for
 extending HTML5 to support RDF.
 .
 HTML::HTML5::Microdata::Parser is a Perl library providing a flexible
 microdata parser for working with an RDF::Trine::Model that can be
 queried with SPARQL.