Exploring an XML Document

The XML specification defines a standard way to add markup to documents. XML users can create their own tags, which relate to their content. Here is an example of an address book, which shows a complete XML document with user-defined tags:

<?xml version="1.0"?>

<classlist>
  <student gender="m">
    <name>
      <firstname>John</firstname>
      <middleinitial>M</middleinitial>
     <lastname>Doe</lastname>
    </name>
    <address>
      <street>10 Main St.</street>
      <city>Sacramento</city>
      <state>CA</state>
      <zip>95814</zip>
    </address>
    <phone areacode="916">123-4567</phone>
    <email>john.doe@acme.com</email>
  </student>
</classlist>

The preceding XML document contains data about a class list, marked up with tags that describe their contents. The <classlist> ...

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