/// <summary>
            /// Builds a <see cref="XrefExporter"/>.
            /// </summary>
            /// <returns>Returns a <see cref="XrefExporter"/>.</returns>
            public XrefExporter Build()
            {
                XrefExporter instance = this.instance;

                this.instance = null;
                return(instance);
            }
 private Builder()
 {
     instance = new XrefExporter();
 }