Group items tagged

"OSF can integrate and manage all types of content - unstructured documents, semi-structured files, spreadsheets, and structured databases - using a variety of best-of-breed engines. All external content is converted to the canonical RDF data model, enabling common tools and methods for tagging and managing all content. Ontologies provide the schema and common vocabularies for integrating across diverse datasets."

Freebase is organized by Domains, which provide a common namespace for annotating Topics. Facts are asserted through Schema (Types & Properties)