def describe_event_categories(SourceType=None, Filters=None):
    """
    Displays a list of categories for all event source types, or, if specified, for a specified source type. You can see a list of the event categories and source types in the Events topic in the Amazon RDS User Guide.
    See also: AWS API Documentation
    
    Examples
    This example lists all DB instance event categories.
    Expected Output:
    
    :example: response = client.describe_event_categories(
        SourceType='string',
        Filters=[
            {
                'Name': 'string',
                'Values': [
                    'string',
                ]
            },
        ]
    )
    
    
    :type SourceType: string
    :param SourceType: The type of source that will be generating the events.
            Valid values: db-instance | db-parameter-group | db-security-group | db-snapshot
            

    :type Filters: list
    :param Filters: This parameter is not currently supported.
            (dict) --This type is not currently supported.
            Name (string) -- [REQUIRED]This parameter is not currently supported.
            Values (list) -- [REQUIRED]This parameter is not currently supported.
            (string) --
            
            

    :rtype: dict
    :return: {
        'EventCategoriesMapList': [
            {
                'SourceType': 'string',
                'EventCategories': [
                    'string',
                ]
            },
        ]
    }
    
    
    :returns: 
    (string) --
    
    """
    pass
