我想<modelnumber>
根据每个模型描述进行显示。我的上下文节点是根级别。
<covergrp>
<producttype>A</producttype>
<model_description>abc</model_description>
<modelnumber>7621</modelnumber>
<modelnumber>7622</modelnumber>
<producttype>B</producttype>
<model_description>XYZ</model_description>
<modelnumber>7624</modelnumber>
<modelnumber>7625</modelnumber>
<producttype>C</producttype>
<model_description>RBC</model_description>
<modelnumber>7629</modelnumber>
<modelnumber>7620</modelnumber>
</covergrp>