dbengines
001 => complete ranking
002 => content stores
003 => document stores
004 => event stores
005 => graph dbms
006 => key-value stores
007 => multivalue dbms
008 => native xml dbms
009 => navigational dbms
010 => object oriented dbms
011 => rdf stores
012 => relational dbms
013 => search engines
014 => time series dbms
015 => wide column stores
