private List<JsonSchemaTreeNode> convertToNodes(List<? extends JsonSchemaObject> children) {
    List<JsonSchemaTreeNode> nodes = new ArrayList<>(children.size());
    for (JsonSchemaObject child: children) {
      nodes.add(new JsonSchemaTreeNode(this, child));
    }
    return nodes;
  }
private List<JsonSchemaTreeNode> convertToNodes(List<? extends JsonSchemaObject> children)