@openstreetmap/id-tagging-schema/data/fields/climbing/bolts.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "climbing:bolts",
    "type": "number",
    "minValue": 0,
    "label": "Number of Bolts",
    "prerequisiteTag": {
        "key": "climbing:sport",
        "value": "yes"
    }
}