def describe_reserved_nodes(ReservedNodeId=None, MaxRecords=None, Marker=None):
    """
    Returns the descriptions of the reserved nodes.
    See also: AWS API Documentation
    
    
    :example: response = client.describe_reserved_nodes(
        ReservedNodeId='string',
        MaxRecords=123,
        Marker='string'
    )
    
    
    :type ReservedNodeId: string
    :param ReservedNodeId: Identifier for the node reservation.

    :type MaxRecords: integer
    :param MaxRecords: The maximum number of response records to return in each call. If the number of remaining response records exceeds the specified MaxRecords value, a value is returned in a marker field of the response. You can retrieve the next set of records by retrying the command with the returned marker value.
            Default: 100
            Constraints: minimum 20, maximum 100.
            

    :type Marker: string
    :param Marker: An optional parameter that specifies the starting point to return a set of response records. When the results of a DescribeReservedNodes request exceed the value specified in MaxRecords , AWS returns a value in the Marker field of the response. You can retrieve the next set of response records by providing the returned marker value in the Marker parameter and retrying the request.

    :rtype: dict
    :return: {
        'Marker': 'string',
        'ReservedNodes': [
            {
                'ReservedNodeId': 'string',
                'ReservedNodeOfferingId': 'string',
                'NodeType': 'string',
                'StartTime': datetime(2015, 1, 1),
                'Duration': 123,
                'FixedPrice': 123.0,
                'UsagePrice': 123.0,
                'CurrencyCode': 'string',
                'NodeCount': 123,
                'State': 'string',
                'OfferingType': 'string',
                'RecurringCharges': [
                    {
                        'RecurringChargeAmount': 123.0,
                        'RecurringChargeFrequency': 'string'
                    },
                ]
            },
        ]
    }
    
    
    :returns: 
    pending-payment-This reserved node has recently been purchased, and the sale has been approved, but payment has not yet been confirmed.
    active-This reserved node is owned by the caller and is available for use.
    payment-failed-Payment failed for the purchase attempt.
    
    """
    pass
