AgensGraph Data Definition Language - http://bitnine.net/support/quick-start-guide-html/
AgensGraph Cypher Query - http://www.agensgraph.com/agensgraph-docs/agensgraph_cypher_query.html
Cypher EBNF Representation - https://s3.amazonaws.com/artifacts.opencypher.org/cypher.ebnf
RailRoad Diagrams - https://s3.amazonaws.com/artifacts.opencypher.org/railroad/Cypher.html
- Statements such as
[ stmt ]
are optional ,
represents a sequence of states.