<student studentID="s005">
<sname>Talor</sname>
<sex>female</sex>
<birthday>1995/12/11</birthday>
</student>
<student studentID="s006">
<sname>David</sname>
<sex>male</sex>
<birthday>1995/02/26</birthday>
</student>
<student studentID="s007">
<sname>Jack</sname>
<sex>male</sex>
<birthday>1995/04/27</birthday>
</student>
<student studentID="s008">
<sname>Tom</sname>
<sex>male</sex>
<birthday>1995/08/10</birthday>
</student>
</students>
<courses>
<course courseID="c001">
<cname>math</cname>
<credit>4</credit>
<description>base</description>
</course>
<course courseID="c002">
<cname>C# programing language</cname>
<credit>4</credit>
<description>base</description>
</course>
<course courseID="c003">
<cname>english</cname>
<credit>3</credit>
<description>base</description>
</course>
</courses>
<grades>
<grade studentID="s001">
<score courseID="c001">45</score>
<resit_info s_type="Supplementary examination.">60</resit_info>
</grade>
<grade studentID="s001">