Data

Tools

Indexes

Applications

Experiments

Awesome

An open API service indexing awesome lists of open source software.

https://github.com/opencypher/openCypher

Specification of the Cypher property graph query language
https://github.com/opencypher/openCypher

cypher database declarative grammar graph language property query specification standard tck

Last synced: 9 days ago
JSON representation

Specification of the Cypher property graph query language

Awesome Lists containing this project

README 

        
ifdef::env-github,env-browser[:outfilesuffix: .adoc]



= The openCypher Property Graph Query Language



This repository holds the specification of openCypher, a declarative property graph query language.

Its purpose is to be central to the process of evolving the specification of openCypher towards https://www.iso.org/standard/76120.html[ISO/IEC 39075 GQL].



The specification of openCypher includes:



* link:/cip[openCypher Improvement Proposals] (CIPs)

* link:/grammar[Grammar] (in ISO WG3 BNF notation)

* link:/tck[Technology Compatibility Kit] (TCK)



== Overview of the process



With https://www.iso.org/standard/76120.html[ISO/IEC 39075 GQL], the purpose of openCypher is to https://neo4j.com/blog/opencypher-gql-cypher-implementation/[pave the road] to GQL for openCypher implementers.

Changes to openCypher are made by adding GQL features to openCypher.



Refer to the link:CIP-PROCESS.adoc[Cypher Improvement Process] document for more details on CIPs, CIRs, their structure and lifecycle.



== The structure of this repository



* Cypher Improvement Proposals (CIP), `/cip`

* openCypher grammar, `/grammar`

** Contains the openCypher grammar specification, in ISO WG3 BNF notation.

* Cypher Technology Compatibility Kit (TCK), `/tck`

** Contains a set of Cucumber features that define openCypher behaviour, and documentation on how to use it.

* openCypher developer tools, `/tools`

** Contains code that tests the integrity of the repository and aids implementers of openCypher.



== Building



This repository uses a Maven build and supports cross building for Scala 2.12 and Scala 2.13:



* For Scala 2.12, use `mvn -U clean install -P scala-212`

* For Scala 2.13 use `mvn -U clean install -P scala-213`



== Contact us



There are several ways to get in touch with the openCypher project and its participants:



* Are you interested in implementing openCypher for your platform, but you have general questions and want to reach out to other community members with similar interests? Post to our https://groups.google.com/forum/#!forum/opencypher[Google Groups mailing list]

* For specific feature requests or bug reports, please open an issue on this repository.

* Do you have a particular contribution in mind, and concrete ideas on how to implement them? Open a pull request.



== History



Prior to ISO/IEC 39075 GQL, the purpose of openCypher was to define a common language for property graphs, and the evolution of the Cypher® language was driven by the openCypher Implementers Group.

Documentation of that time can be found https://opencypher.org/oC9history[the website] and in https://github.com/opencypher/openCypher/tree/master[this branch of the repository].



== Copyright



© Copyright https://neo4j.com[Neo4j, Inc.]



== Feedback



Any feedback you provide to Neo4j, Inc. through this repository shall be deemed to be non-confidential.

You grant Neo4j, Inc. a perpetual, irrevocable, worldwide, royalty-free license to use, reproduce, modify, publicly perform, publicly display and distribute such feedback on an unrestricted basis.



== License



The `openCypher` project is licensed under the http://www.apache.org/licenses/LICENSE-2.0[Apache license 2.0].



== Trademark



Neo4j's trademark policy is available at https://neo4j.com/trademark-policy/[our trademark policy page].