public static class SelectorExtensions
    {
        /// <summary>
        /// Returns the first element within the given elements (using depth-first
        /// pre-order traversal) that match the selectors with the given scope.
        /// </summary>
        /// <param name="selector">A selector object.</param>
        /// <param name="elements">The elements to take as source.</param>
        /// <param name="scope">The element to take as scope.</param>
        /// <returns>The resulting element or null.</returns>
        public static IElement MatchAny(this ISelector selector, IEnumerable<IElement> elements, IElement scope)
        {
            foreach (var element in elements)
            {
                foreach (var descendentAndSelf in element.DescendentsAndSelf<IElement>())
                {
                    if (selector.Match(descendentAndSelf, scope))
                    {
                        return descendentAndSelf;
                    }
                }
            }

            return null;
        }