@openstreetmap/id-tagging-schema/data/fields/survey_point/purpose.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "survey_point:purpose",
    "type": "combo",
    "label": "Purpose",
    "strings": {
        "options": {
            "horizontal": "Horizontal Alignment",
            "vertical": "Vertical Alignment",
            "both": "Both"
        }
    }
}