Fedora Commons is the home of the unique Fedora open source software, a robust integrated repository-centered platform that enables the storage, access and management of virtually any kind of digital content.
To be clear - preferring to manage content *as content*, instead of lossy extraction of domain entities is about preferring flexibility and independent evolution of systems. There's plenty of room for an argument that says RDBMS is suboptimal for managing content. And good luck with versioning or translation on top of relational databases while trying to manage the form and flexibility of the content over time. Yes, you can do it, but it's highly specialised and diffiicult work. Annotated link http://www.diigo.com/bookmark/http%3A%2F%2Fwww.dehora.net%2Fjournal%2F2006%2F08%2Fzope_java_content_repository_and_web_architecture.html