schema.json

{
    "primaryKey": "id",
    "fields": [
        {
            "name": "id",
            "title": "Measurement identifier",
            "type": "integer"
        },
        {
            "name": "location",
            "title": "Measurement location code",
            "type": "string",
            "constraints": {
                "enum": ["A", "B", "C", "D"]
            }
        },
        {
            "name": "date",
            "title": "Measurement date",
            "type": "date",
            "format": "%d/%m/%Y"
        },
        {
            "name": "measurement",
            "title": "Measure of the oblique fractal impedance at noon",
            "type": "number",
            "constraints": {
                "required": true
            }
        },
        {
            "name": "observations",
            "title": "Extra observations",
            "type": "string"
        }
    ]
}