Specifications OPDS (Open Publication Distribution System) is a family of specifications dedicated to the distribution of digital publications. The historical version of OPDS (1.x) is based on Atom and Dublin Core, while the current draft (2.0) is based on JSON-LD and schema.org. Stable OPDS 1.2 (November 11th, 2018) Drafts OPDS 2.0 See all active drafts Previous releases OPDS 1.1 (June 27th, 2011