/// <summary>
 /// Visits a NullLiteral builder.
 /// </summary>
 /// <param name="item">The item to visit.</param>
 protected internal virtual void VisitNullLiteral(NullLiteral item)
 {
 }
 /// <summary>
 /// Generates the text for a NullLiteral builder.
 /// </summary>
 /// <param name="item">The NullLiteral builder to generate the text for.</param>
 protected internal override void VisitNullLiteral(NullLiteral item)
 {
     writer.Write("NULL");
 }
 /// <summary>
 /// Visits a NullLiteral builder.
 /// </summary>
 /// <param name="item">The item to visit.</param>
 protected internal virtual void VisitNullLiteral(NullLiteral item)
 {
 }