Modular data model

[jbemmel]

In theory, modules could dynamically extend the data model.

For example: A 'lag' module could add a 'lag' link type by extending the 'valid_values' at

netlab/netsim/defaults/attributes.yml

Line 52 in 1f59a60

type: { type: str, valid_values: [ lan, p2p, stub, loopback, tunnel, vlan_member ] }

instead of modifying that file directly.

What do people think about this? Would it be "too much", over-complicating readability?

[ipspace]

Adding a new link type value during the module initialization phase might be better than modifying the attribute definition -- it would prevent someone from using the new link type without the lag module.