/// <summary>
/// 设置到restrition file的某父级结点，以便调用 public bool Validate(string value, string childname) 检查各childname
/// </summary>
/// <param name="xpath">XPath格式为:名称1.子名称2.子名称3</param>
/// <returns></returns>
public bool SetParentPath(string xpath)
{
if (root.ChildrenByPath(xpath) == null)
{
return(false);
}
root = root.ChildrenByPath(xpath).First();
return(root.HasChildren);
}