{
    "key": "source",
    "type": "semiCombo",
    "icon": "source",
    "universal": true,
    "label": "Sources",
    "snake_case": false,
    "caseSensitive": true,
    "options": [
        "survey",
        "local knowledge",
        "gps",
        "aerial imagery",
        "streetlevel imagery"
    ]
}