<ProductName>Chang</ProductName>

</Category>

<Category ID="2">

         Condiments

         <ProductID>3</ProductID>

         <ProductName>Aniseed Syrup</ProductName>

</Category>

<Category ID="2">

         Condiments

         <ProductID>4</ProductID>

         <ProductName>Chef Anton&apos;s Cajun Seasoning</ProductName>

</Category>

从上面的结构可以看出数据的xml结构不是很舒服，存在比较大的冗余。想象中改进后的结构如下：

<Category ID="2" Name="Condiments">

         <Product>

                   <ProductID>3</ProductID>

                   <ProductName>Aniseed Syrup</ProductName>

         </Product>

         <Product>

                   <ProductID>4</ProductID>

                   <ProductName>Chef Anton&apos;s Cajun Seasoning</ProductName>

         </Product>

</Category>

<Category ID="1" Name="Beverages">

         <Product>

                   <ProductID>1</ProductID>

                   <ProductName>Chai</ProductName>

         </Product>

         <Product>

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