Ever wondered how a graph database schema looks in practice? Or maybe you've already tried databases like neo4j, but not OrientDB. Here's how the CEO of Orient Technologies describes OrientDB:
OrientDB is a Graph Database "on steroids" because it supports concepts taken from both the Document Database and Object-Oriented worlds.
-- Luca Garulli, CEO of Orient Technologies
So if that sounds intriguing to you, you should check out this introductory series to OrientDB and using graph schema with it.