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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_model_domain(model, domain):
 """ Sets the domain on the ONNX model. :param model: instance of an ONNX model :param domain: string containing the domain name of the model Example: :: from onnxmltools.utils import set_model_domain onnx_model = load_model("SqueezeNet.onnx") set_model_domain(onnx_model, "com.acme") """

    if model is None or not isinstance(model, onnx_proto.ModelProto):
        raise ValueError("Model is not a valid ONNX model.")
    if not convert_utils.is_string_type(domain):
        raise ValueError("Domain must be a string type.")
    model.domain = domain