Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables.
'org.neo4j.maven.skins:default-skin:2'
<dependency> <groupId>org.neo4j.maven.skins</groupId> <artifactId>default-skin</artifactId> <version>2</version> </dependency>
<dependency org="org.neo4j.maven.skins" name="default-skin" rev="2"/>
"org.neo4j.maven.skins", "default-skin", "2"