Sylva: A Relaxed Schema Graph Database Management System
From the webpage:
Sylva [from the Old Spanish “silva”, a Rennaisance type of book to organize knowledge] is a free, easy-to-use, flexible, and scalable database management system that helps you collect, collaborate, visualize and query large data sets.
No programming knowledge is required to use Sylva!
The data sets are stored according to the schemas (graphs) created by the user, and can be visualized as networks and as lists. Researchers have absolute freedom to grant different permits to collaborators and to import and export their schemas and data sets.
Start using Sylva as soon as it becomes available!
Not available, yet, but putting it on a watch list.
The splash page reads as though graph operations can be restricted by a schema.
That would be an interesting capability.
In particular if workflow could be modeled by a schema.