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Neo4j is an open-source graph database implemented in Java and accessible from software written in other languages using the Cypher query language through a transactional HTTP endpoint. The developers describe Neo4j as an ACID-compliant transactional database with native graph storage and processing.〔(【引用サイトリンク】title= Neo4j Graph Database )〕 Neo4j is the most popular graph database. Neo4j version 1.0 was released in February, 2010. The community edition of the database is licensed under the free GNU General Public License (GPL) v3. The additional modules, such as online backup and high availability, are licensed under the free Affero General Public License (AGPL) v3. The database, with the additional modules, is also available under a commercial license, in a dual license model. Neo4j version 2.0 was released in December, 2013. Neo4j is developed by Neo Technology, Inc., based in the San Francisco Bay Area, US and Malmö, Sweden. == Licensing and editions == Neo4j comes in 3 editions: Community, Enterprise, and Government. It is dual-licensed: GPLv3 and AGPLv3 / commercial. The Community Edition is free but is limited to running on 1 node only due to the lack of clustering and is without hot backups. The Enterprise Edition (which requires buying a license unless the application built on top of it is open-sourced) unlocks these limitations allowing for clustering, hot backups and monitoring. The Government Edition extends the Enterprise Edition adding additional government specific services including FISMA related certification and accreditation support. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neo4j」の詳細全文を読む スポンサード リンク
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