hGRDDL: Bridging microformats and RDFa

We propose hGRDDL (pronounced “h-griddle”), a simple mechanism for transforming ad hoc HTML-embedded structured data, such as microformats, into RDFa. This technique preserves the advantages of the original syntax, notably the correspondence between the rendered HTML and the related structured data, and requires little change on the publisher end. RDFa tool developers can leverage the existing deployments of microformats, while focusing new deployments on RDFa for greater extensibility and consistency, all using the same client-side toolset. We provide a prototype implementation of the hGRDDL processor and of transformations for hCard and hCal, two popular microformats.