Graph Backend Evaluation

	Neo4j	OrientDB	ArangoDB	JanusGraph
Official Documentation	link	link	link	link
Proprietary Query Language	Cypher	-	AQL	-
Native API	Weird, and relies on AQL for Queries	Relies on SQL for Queries	Nice, but relies on AQL for Queries	✘
REST API	✔	✔ + Spring	✔ + Spring & Swagger	✘
Gremlin	✔	✔	Maybe, 3rd party	✔
License	GPL3	Apache2	Apache2	Apache2
Note	Largest graph DB	Mainly a document store	Web interface actually showing the graph	Middleware, uses other DB for actual storage

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Git

• Git
• Would probably work
• Hard to query
• Has a plugin to handle EMF files
• GPL2

Gremlin

• Graph database management service/ language / VM
• Licensed under Apache2
• Probably hard to learn
• Nearly every graph database supports it

MongoEMF

• community Eclipse plug-in to save EMF to MongoDB (document store)
• requires user to run code
• queries using mongoDB's prop QL

gun

Morsa: Seen only in the title of paper

EMF persistence: given by e, saves XML, requires running code (basically only for plugin dev)

NeoEMF: