What functionality are you looking for in a theme beyond what is already set up within the two WordPress webmention plugins (Webmention and Semantic Linkbacks)? Are you asking about Microformats markup in themes?
I'm a biomedical and electrical engineer with interests in information theory, complexity, evolution, genetics, signal processing, IndieWeb, theoretical mathematics, and big history. I'm also a talent manager-producer-publisher in the entertainment industry with expertise in representation, distribution, finance, production, content delivery, and new media. View all posts by Chris Aldrich