/// <summary>
        /// @since 1.1
        ///
        /// </summary>
        public virtual IComparer <string> get_collation(string uri)
        {
            //if (DynamicContext_Fields.CODEPOINT_COLLATION.Equals(uri))
            //{
            //	return CODEPOINT_COMPARATOR;
            //}

            return(_collation_provider != null?_collation_provider.get_collation(uri) : null);
        }