{
    "$schema": "http://json-schema.org/draft-07/schema#",

    "description": "This schema represents a person's heart rate.",
    "type": "object",
    "references": [
        {
            "description": "The SNOMED code represents Pulse rate (observable entity)",
            "url": "http://purl.bioontology.org/ontology/SNOMEDCT/78564009"
        }
    ],

    "definitions": {
        "unit_value": {
             "$ref": "unit-value-1.x.json"
        },
        "time_frame": {
            "$ref": "time-frame-1.x.json"
        },
        "descriptive_statistic": {
            "$ref": "descriptive-statistic-1.x.json"
        },
        "temporal_relationship_to_physical_activity": {
            "$ref": "temporal-relationship-to-physical-activity-1.x.json"
        },
        "temporal_relationship_to_sleep": {
            "$ref": "temporal-relationship-to-sleep-1.x.json"
        }
    },

    "properties": {
        "heart_rate": {
            "allOf": [
                {
                    "$ref": "#/definitions/unit_value"
                },
                {
                    "properties": {
                        "unit": {
                            "enum": [
                                "beats/min"
                            ]
                        }
                    }
                }
            ]
        },
        "effective_time_frame": {
            "$ref": "#/definitions/time_frame"
        },
        "descriptive_statistic": {
            "$ref": "#/definitions/descriptive_statistic"
        },
        "temporal_relationship_to_physical_activity": {
            "$ref": "#/definitions/temporal_relationship_to_physical_activity"
        },
        "temporal_relationship_to_sleep": {
            "$ref": "#/definitions/temporal_relationship_to_sleep"
        }
    },

    "required": [
        "heart_rate",
        "effective_time_frame"
    ]
}