[
    { 
        "id": "demo_root_1", 
        "text": "Root #1", 
        "children": true, 
        "type": "root",
        "file": "data_children_root_1.json",
        "state": {
            "opened": true
        }
    },{ 
        "id": "demo_root_2", 
        "text": "Root #2", 
        "children": true, 
        "type": "root",
        "file": "data_children_root_2.json"
    },{ 
        "id": "demo_root_3", 
        "text": "Root #3", 
        "children": true, 
        "type": "root",
        "file": "data_children_root_3.json"
    },{ 
        "id": "demo_root_4", 
        "text": "Root #4", 
        "children": true, 
        "type": "root",
        "file": "data_children_root_4.json"
    }
]