README.md

Object Diagram (M0) to JSON

This VTL report converts a set MagicDraw Instance Specifications into an equivalent set of JSON representations.

Method of Transformation

All data in an object instance is stored in one or more slots. Slots store things such as attributes, and associations.

Each slot is converted to a property of the same name.

To maintain compatibility with NIST 1500 generated JSON Schemas, each generated object contains the property @type whose value is in the form of {Package}.{ClassName}.

{
    "@type": "VRI.VoterClassification"
}

Each object instance will result in a separate JSON property named the same as the object, and whose value is the object and its dereferenced associations.

Example

The above UML Model translates to the following JSON code.

{
    "@type": "VRI.VoterRecordsRequest",
    "Subject": {
        "@type": "VRI.Voter",
        "VoterClassification": [
            {
                "@type": "VRI.VoterClassification",
                "Type": "eighteen-on-election-day"
            }
        ],
        "VoterId": [
            {
                "@type": "VRI.VoterId",
                "Type": "state-voter-registration-id",
                "StringValue": "VA0012345678"
            },
            {
                "@type": "VRI.VoterId",
                "Type": "ssn4",
                "StringValue": "1234"
            }
        ],
        "Type": [
            "registration"
        ],
        "Name": {
            "@type": "VRI.Name",
            "FirstName": "Franklin",
            "LastName": "Beatty"
        },
        "DateOfBirth": "3/30/1937"
    },
    "Type": [
        "ballot-request"
    ],
    "BallotRequest": {
        "@type": "VRI.PermanentBallotRequest",
    },
    "GeneratedDate": "9/24/18"
}

Associations

All references (e.g. directed associations) are dereferenced to form a single JSON instance.

Handling of Multiplicities

Attributes or associations at M1 having a multiplicity with a upper cardinality of greater than 1 are generated as arrays.