    /// Represents an expression that indicates the search parameter should be missing.
    /// </summary>
    public class MissingSearchParameterExpression : SearchParameterExpressionBase
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="MissingSearchParameterExpression"/> class.
        /// </summary>
        /// <param name="searchParameter">The search parameter this expression is bound to.</param>
        /// <param name="isMissing">A flag indicating whether the parameter should be missing or not.</param>
        public MissingSearchParameterExpression(SearchParameter searchParameter, bool isMissing)
            : base(searchParameter)
        {
            IsMissing = isMissing;
        }
