{
    "source_files": [
        {
            "name": "foo1.csv",
            "delimiter": ",",
            "fields": [
                { "source_name": "a", "field_type": "Unsigned", "add_to_frame": true }
            ]
        },
        {
            "name": "foo2.tsv",
            "delimiter": "\t",
            "fields": [
                { "source_name": "b", "field_type": "Signed", "add_to_frame": true },
                { "source_name": "c", "field_type": "Float", "add_to_frame": true }
            ]
        }
    ],
    "transforms": [
        {
            "method": { "action": "Concatenate", "separator": "!!" },
            "source_fields": [ "a", "b" ],
            "target_name": "cat_ab"
        },
        {
            "method": { "action": "Map", "default_value": "-1", "map": { "M": "0", "F": "1" } },
            "source_fields": [ "c" ],
            "target_name": "map_c"
        }

    ]
}