def get_parameter_value(fhir_operation, parameter_name):
    """
    Find the parameter value provided in the parameters
    :param fhir_operation: the fhir operation definition
    :param parameter_name: the name of the parameter to get the value of
    :return: a string representation of th value
    """
    parameter_value = ''
    for param in fhir_operation.parameter:
        if param.name == parameter_name:
            parameter_value = param.binding.valueSetReference.identifier.value
    return parameter_value