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public static IEnumerable<TResult> SelectSome<T, TResult>(this IEnumerable<T> source, Func<T, Maybe<TResult>> selector)
{
    return source.Select(selector).SelectMany(item => item.ToEnumerable());
}

public static Maybe<T> SingleOrNone<T>(this IQueryable<T> source);
public static Maybe<T> SingleOrNone<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate);

public static Maybe<T> FirstOrNone<T>(this IQueryable<T> source);
public static Maybe<T> FirstOrNone<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate);

public static Maybe<T> LastOrNone<T>(this IQueryable<T> source);
public static Maybe<T> LastOrNone<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate);

public static T? OrNull<T>(this Maybe<T> source) where T : struct {}

// Collections
public static Maybe<TValue> GetValueOrNone<TKey, TValue>(this IDictionary<TKey, TValue> source, TKey key);
public static IEnumerable<T> Some<T>(this IEnumerable<T> source);

// ReactiveX-like operators
public static Maybe<T> WhenSome<T>(this Maybe<T> source, Action<T> action);
public static Maybe<T> WhenNone<T>(this Maybe<T> source, Action<None> action);
public static Maybe<T> WhenNone<T>(this Maybe<T> source, Action action);

public class Attribute 
{
    [Required]
    public Translation Translation { get; }

    public class Translation
    {
        [Required]
        public string Id { get; }
        public Maybe<string> Name { get; }
    }
}