{
    "NodeRootType": "TExprBase",
    "NodeBuilderBase": "TNodeBuilderBase",
    "ListBuilderBase": "TListBuilderBase",
    "FreeArgCallableBase": "TFreeArgCallable",
    "FreeArgBuilderBase": "TFreeArgCallableBuilderBase",
    "Nodes": [
        {
            "Name": "TPgDataSource",
            "Base": "TCallable",
            "Definition": "Custom",
            "Match": {"Type": "Callable", "Name": "DataSource"},
            "Children": [
                {"Index": 0, "Name": "Category", "Type": "TCoAtom"},
                {"Index": 1, "Name": "Cluster", "Type": "TCoAtom"}
            ]
        },
        {
            "Name": "TPgRead",
            "Base": "TFreeArgCallable",
            "Match": {"Type": "Callable", "Name": "Read!"},
            "Children": [
                {"Index": 0, "Name": "World", "Type": "TExprBase"},
                {"Index": 1, "Name": "DataSource", "Type": "TPgDataSource"}
            ]
        },
        {
            "Name": "TPgReadTable",
            "Base": "TCallable",
            "Match": {"Type": "Callable", "Name": "PgReadTable!"},
            "Children": [
                {"Index": 0, "Name": "World", "Type": "TExprBase"},
                {"Index": 1, "Name": "DataSource", "Type": "TPgDataSource"},
                {"Index": 2, "Name": "Table", "Type": "TCoAtom"},
                {"Index": 3, "Name": "Columns", "Type": "TExprBase"},
                {"Index": 4, "Name": "Settings", "Type": "TExprList"}
            ]
        },
        {
            "Name": "TPgTableContent",
            "Base": "TCallable",
            "Match": {"Type": "Callable", "Name": "PgTableContent"},
            "Children": [
                {"Index": 0, "Name": "Cluster", "Type": "TCoAtom"},
                {"Index": 1, "Name": "Table", "Type": "TCoAtom"},
                {"Index": 2, "Name": "Columns", "Type": "TExprBase"},
                {"Index": 3, "Name": "Settings", "Type": "TExprList"}
            ]
        }
    ]
}