<?xml version="1.0" standalone="yes"?>
<NewDataSet>
<ds>
<CategoryID>1</CategoryID>
<CategoryName>Packaging Materials</CategoryName>
<ParentID>0</ParentID>
</ds>
<ds>
<CategoryID>2</CategoryID>
<CategoryName>Packaging Products</CategoryName>
<ParentID>0</ParentID>
</ds>
<ds>
<CategoryID>3</CategoryID>
<CategoryName>Packaging,Printing and Related Converter Machinery</CategoryName>
<ParentID>1</ParentID>
</ds>
<ds>
<CategoryID>4</CategoryID>
<CategoryName>Paper & Board</CategoryName>
<ParentID>1</ParentID>
</ds>
<ds>
<CategoryID>5</CategoryID>
<CategoryName>Direct Packaging Machinery</CategoryName>
<ParentID>2</ParentID>
</ds>
<ds>
<CategoryID>6</CategoryID>
<CategoryName>Paper Packaging Products</CategoryName>
<ParentID>2</ParentID>
</ds>
</NewDataSet>
读取以上xml实现2级下拉联动
