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Question about tag and value

From: mittra@----.---
To: NULL
Date: 11/5/2007 3:56:00 PM

Hello All,

I am a newbie to XML. I have the following question: how do I express
something in XML when the subsequent tag structures depends on the
value of a preceeding tag?

For example, when TAG2 has a value of 1, then TAG3 exists.

<TAG1>
   <TAG2>1</TAG2>
   <TAG3>some_value</TAG3>
</TAG1>

But when TAG2 has a value of 2, then TAG4 exists.

<TAG1>
   <TAG2>2</TAG2>
   <TAG4>some_value2</TAG4>
</TAG1>

Can the above two be combined into a single structure for TAG1?

Thanks for your insight.



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