## ELL Archive version history

| Version | Comments / Changes|
|---------|-------------------|
|       1 | old               |
|       2 | current           |
|       3 | adds metadata to Model, Node, Port, and Map |
|       4 | adds shapes to SourceNode and SinkNode |
|       5 | enabled unarchiving of refined models containing Neural Network layer Nodes, and Broadcast Unary Function Nodes |
|       6 | adds a trigger to SinkNode |

When objects start being able to read different format versions, there
will be notes here about forward/backward compatibility:

- Version can be read by: (oldest code version that can still read this)
- Version can read: (oldest archive version still readable)
