RDFa is the least obnoxious way of embedding RDF in HTML, but still more verbose than microformats. (See example below.)
RDFa adds several attributes to standard HTML:
typeof to specify an RDF resource type,
vocab to specify the schema containing the type, and (much more plentifully)
property to specify the field names described by markup nodes. Microformats use the already existing
class for all these purposes (except
vocab which it largely elects not to bother with).