Cypher Multi-Graphs

- Combining and transforming multiple sources - Versioning, snapshotting, computing difference graphs - Graph views for access control - Provisioning applications with tailored graph views - Shaping and integrating heterogeneous graph data - Roll-up and drill-down at different levels of detail

Classic Property Graph Model - A single graph - Labeled nodes with properties - Typed, directed relationships with properties

Multiple Property Graphs Model - Multiple graphs - Labeled nodes with properties and typed, directed relationships with properties existing in a single graph - The nodes of a relationship R must be part of the same graph as R; i.e. each graph is independent

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Wandering through the PDF I was reminded of my longing for version control that used a combination of understanding the abstract syntax tree of the programming language and a tree-based diff algorithm instead of our conventional line-based diff algorithms.

It would be nice to see diffs that showed a method extraction, for example. And it would be nice to reason about changes to code more closely to their grammatical structures. I think it would change the way we code.

This time around I found some new vocabulary (compared to the last time I went searching for prior art) - Graph isomorphism problem: wikipedia turns out to be an area deeply explored - Differences between tree structures: stackoverflow Trees are simpler than graphs. Some answers include pointers to specific existing libraries.