text: The collection of structure nodes within the document forms a tree; each node has a 
  
  parent node and may also have sibling nodes. The**idNodeParent**and**iSortOrder**
  
  members describe the structure of this tree. Note that a child node may or may not 
  
  appear between the**DocExComment_BeginStructNode**and 
  
  **DocExComment_EndStructNode**structures of the parent node in the EMF. 