将NSXMLParser与包含表的XML一起使用

Question

假设我在XML中有以下表格：

<row>
  <Header>Top Left corner (will contailn an X)</Header>
  <Header>Header1</Header>
  <Header>Header2</Header>
  <Header>Header3</Header>
</row>
  <rowHeader>Same As Header1</rowHeader>
  <cell>Mix of Header 1 and Header 1</cell>
  <cell>Mix of Header 1 and Header 2</cell>
  <cell>Mix of Header 1 and Header 3</cell>
<row>
  <rowHeader>Same As Header2</rowHeader>
  <cell>Mix of Header 2 and Header 1</cell>
  <cell>Mix of Header 2 and Header 2</cell>
  <cell>Mix of Header 2 and Header 3</cell>
</row>
<row>
  <rowHeader>Same As Header3</rowHeader>
  <cell>Mix of Header 3 and Header 1</cell>
  <cell>Mix of Header 3 and Header 2</cell>
  <cell>Mix of Header 3 and Header 3</cell>
</row>

这样我就得到了两个对象组合的结果（比如乘法）。这将在我的源代码中保存为.xml文件。我的问题是，如何使用xcode中的NSXMLParser获取值为Mix of Header 1 and Header 3的单元格？只是为了进一步解释，我应该能够发送标题（标签）和行标题（标签）的值，并在内部单元格（标签）上得到结果