{
   "lang": "en",
   "type": "Document",
   "~children": [ {
      "type": "NonStruct",
      "~children": [ {
         "attributes": [ {
            "O": "PrintField",
            "Role": "cb"
         }, {
            "Desc": "First unchecked checkbox",
            "O": "PrintField"
         } ],
         "type": "Form"
      }, {
         "attributes": [ {
            "O": "PrintField",
            "Role": "cb"
         } ],
         "type": "Form"
      }, {
         "type": "NonStruct"
      }, {
         "attributes": [ {
            "O": "PrintField",
            "Role": "cb"
         }, {
            "O": "PrintField",
            "checked": "on"
         } ],
         "type": "Form"
      }, {
         "type": "NonStruct"
      } ]
   } ]
}