{
    "blockType":"when",
    "blockOptions":{
        "method":{
            "name":"isItemStateChanged",
            "args":{
                "item":"item",
                "start": "start",
                "finish": "finish"
            }
        }
    },
    "fields":[
        {
            "name":"item",
            "type":"item",
            "value":"897607_32771_1"
        },
        {
            "name":"start",
            "type":"int",
            "value":10
        },
        {
            "name":"finish",
            "type":"expression",
            "value":"my_best_expression"
        }
    ]
}