913aca9a_ent_repository___Henri_Bergius__CouchDB
[feature] versioning [JCR / Jackrabbit] Checkin/checkout model to create new versions of nodes, optionally versions complete sub-trees, supports branching of versions. [Midgard] No versioning [CouchDB] 
All versions of content are stored and accessible separately, no branching
What is a content repository - Henri Bergius
CouchDB