void RenderBlockSequenceInto(BlockSequence blockSequence, XmlElement container, int? parentSections)
 {
     foreach (Block block in blockSequence.Blocks)
     {
         RenderBlockInto(block, container, parentSections);
     }
 }
 void RenderBlockSequenceInto(BlockSequence blockSequence, XmlElement container)
 {
     foreach (Block block in blockSequence.Blocks)
     {
         RenderBlockInto(block, container);
     }
 }
 public virtual void VisitBlockSequence(BlockSequence sequence)
 {
 }