关于图数据库查询语言：Cypher

Neo4j Cypher Refcard：http://neo4j.com/docs/cypher-refcard/current/
Neo4j发布开源图查询语言openCypher：http://www.infoq.com/cn/news/2015/11/neo4j-opencypher
http://www.opencypher.org/
The Cypher Query Language：https://github.com/opencypher/openCypher