is reference setting (property)

{
    "$id": "https://schemas.anyterial.se/defs/v0.1/properties/spacegroups/is_reference_setting",
    "$schema": "https://schemas.optimade.org/meta/v1.3/optimade/property_definition.json",
    "title": "is reference setting",
    "x-optimade-type": "boolean",
    "x-optimade-definition": {
        "kind": "property",
        "version": "0.1.0",
        "format": "1.3",
        "name": "is_reference_setting",
        "label": "is_reference_setting_spacegroups"
    },
    "type": [
        "boolean",
        "null"
    ],
    "description": "Boolean flag indicating whether this Hall setting is the selected reference setting for its International Tables space-group number.",
    "x-optimade-unit": "inapplicable",
    "examples": [
        true,
        false
    ]
}