Questions regarding json (VerveineJ) in model vs metamodel

[fuhrmanator]

Here are some questions regarding the JSON model file generated by VerveineJ:

• The previous entries on some Access entities exist. It seems there's one Access (probably the start) that has none. Is it a convenience for Moose? Why aren't they in all entities? Here's an example:

    {
        "FM3": "Famix-Java-Entities.Access",
        "id": 61,
        "accessor": {
            "ref": 87
        },
        "previous": {
            "ref": 7
        },
        "variable": {
            "ref": 6
        }
    },

• What are the other elements where we using these? So far, I found Famix-Java-Entities.Implementation