Alright, I'm trying to allow only the following inputs (electronics, groceries, household) to be allowed in the category element, however I cannot figure out the correct way to do this. I'm using an internal DTD and have two full examples of how I want it to handle documents. Here is the code:Alright, I'm trying to allow only the following
阅读背景：
XML仅允许使用DTD的元素中的某些输入
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