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<h1>XML Elements</h1>
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<p class="intro">An XML document contains XML Elements.</p>
<hr />
<h2>What is an XML Element?</h2>
<p>An <b>XML element</b> is everything from (including) the element's start tag
to (including) the element's end tag.</p>
<p>An element can contain other elements, simple text or a mixture of both. Elements can also have attributes.</p>
<table class="ex" width="100%" border="1" cellpadding="0" cellspacing="0" id="table1">
<tr><td><pre><bookstore>
<book category="CHILDREN">
<title>Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title>Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore></pre>
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<p>In the example above, <bookstore> and <book> have <b>element contents</b>, because
they contain other elements. <author> has <b>text content</b> because it contains text.</p>
<p>In the example above only <book> has an <b>attribute</b>
(category="CHILDREN").
</p>
<hr />
<h2>XML Naming Rules</h2>
<p>XML elements must follow these naming rules:</p>
<ul>
<li>Names can contain letters, numbers, and other characters</li>
<li>Names must not start with a number or punctuation character</li>
<li>Names must not start with the letters xml (or XML, or Xml, etc)</li>
<li>Names cannot contain spaces</li>
</ul>
<p>Any name can be used, no words are reserved.</p>
<hr />
<h2>Best Naming Practices</h2>
<p>Make names descriptive. Names with an underscore separator are nice: <first_name>,
<last_name>.</p>
<p>Names should
be short and simple, like this: <book_title> not like this: <the_title_of_the_book>. </p>
<p>Avoid "-" characters. If you name something "first-name,"
some software may think you want to subtract name from first.</p>
<p>Avoid "." characters. If you
name something "first.name," some software may think that "name" is a property
of the object "first."</p>
<p>Avoid ":" characters. Colons are reserved
to be used for something called namespaces (more later).</p>
<p>XML documents often have a corresponding database. A
good practice is to use the naming rules of your database for the elements in the XML documents.</p>
<p>Non-English letters like 轵⌨️ 快捷键说明
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