flexible RDFa parser

 Resource Description Framework (RDF) is a standard model for data
 interchange on the Web.
 .
 RDFa is a collection of attributes and processing rules for extending
 XHTML to support RDF.
 .
 RDF::RDFa::Parser is a Perl library providing a flexible RDFa parser
 for e.g....:
  * working with an RDF::Trine::Model that can be queried with SPARQL
  * dealing with local data
  * working with Open Graph Protocol data