svoid dm_gazelle_expandTree(GazelleTree tree) {
  dm_gazelle_expandTree(tree, 10);
}

svoid dm_gazelle_expandTree(GazelleTree tree, int maxLevel) {
  if (maxLevel <= 0 || tree == null) ret;
  if (tree.ctx == null) tree.ctx = dm_gazelle_stdEvalContext();
  for (GazelleTree t : dm_gazelle_getChildren(tree))
    dm_gazelle_expandTree(t, maxLevel-1);
}