{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "This schema represents a range of numerical values with a unit of measure. The lower and upper boundaries are included in the interval.",
    "type": "object",
    "properties": {
        "low_value": {
            "description": "The lower boundary of the range.",
            "type": "number"
        },
        "high_value": {
            "description": "The upper boundary of the range.",
            "type": "number"
        },
        "unit": {
            "references": [
                {
                    "description": "The unit of measure of the element. Allowed values are drawn from the Common synonyms (non-UCUM) column of [subset of] UCUM, SI and English units. ",
                    "url": "http://download.hl7.de/documents/ucum/ucumdata.html"
                }
            ],
            "type": "string"
        }
    },
    "required": [
        "low_value",
        "high_value",
        "unit"
    ]
}