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Graph Databases: A Special Case of Document Databases?

Oren Eini:

Once you figured out that graph database can be seen as document databases with a special document type, you are pretty much done.

That’s an interesting perspective, with which unfortunately I disagree. The defining characteristic of graph databases is the strong data connectedness which is almost completely missing in document databases.

Update: Some may even say NoSQL databases are hierarchical

via: http://ayende.com/Blog/archive/2010/05/06/that-no-sql-thing-graph-databases.aspx