IBM网站上给出的XML的介绍（4）不完全摘录
Elements are case sensitive
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这里说的是：XML是一种“强类型标记语言”（区分大小写）
XML elements are case sensitive. In HTML, <h1> and <H1> are the same; in XML, they're not. If you try to end an <h1> element with a </H1> tag, you'll get an error. In the example below, the heading at the top is illegal, while the one at the bottom is fine.
<!-- NOT legal XML markup -->
<h1>Elements are
case sensitive</H1>
<!-- legal XML markup -->
<h1>Elements are
case sensitive</h1>
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