SQL server 2008 XML数据类型是否存在性能问题

Hi I have a need to store hundreds if not thousands of elements in the database as XML. I will not index anything in the XML field. I will simply select certain elements within the xml. I would like to know if there is any performance penalty for simply selecting fields in the XML. Here is example XML that will be stored in the database.Hi I have a need to store hundreds if not thous