Retrieved on 2013-09-18. ↑ CouchDB Overview Archived October 20, 2011, at the Wayback Machine. ↑ "HTTP_Document_API - Couchdb Wiki". ↑ "Archived copy". Archived from the original on 2015-06-22. Retrieved 2015-06-22. ↑ eXist-db Open Source Native XML Database.