/**
  * DOC ke Comment method "disconnectSubTree".
  *
  * @param node
  */
 private void disconnectSubTree(HL7TreeNode node) {
   if (node == null) {
     return;
   }
   if (node.hasLink()) {
     node.setColumn(null);
   }
   List<HL7TreeNode> children = node.getChildren();
   for (HL7TreeNode child : children) {
     disconnectSubTree(child);
   }
 }