def initialize_all_repository_dependencies( current_repository_key, repository_dependencies_dict, all_repository_dependencies ):
    """Initialize the all_repository_dependencies dictionary."""
    # It's safe to assume that current_repository_key in this case will have a value.
    all_repository_dependencies[ 'root_key' ] = current_repository_key
    all_repository_dependencies[ current_repository_key ] = []
    # Store the value of the 'description' key only once, the first time through this recursive method.
    description = repository_dependencies_dict.get( 'description', None )
    all_repository_dependencies[ 'description' ] = description
    return all_repository_dependencies