sDB = {
            "demographics": {
                "age": {
                    "name": "age",
                    "description": "Age in years",
                    "type": "continuous",
                    "range": [18, 100],
                    "unit": "years",
                    "keywords": ["demographic", "age"],
                    "reference": "Standard demographic measure"
                },
                "gender": {
                    "name": "gender",
                    "description": "Sel