schema_complex.asp

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<p>We can define a complex element in an XML Schema two different ways:</p>
<p>1. The &quot;employee&quot; element can be declared directly by naming the 
element, 
like this:</p>
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  <tr>
    <td>
      <pre>&lt;xs:element name=&quot;employee&quot;&gt;
  &lt;xs:complexType&gt;
    &lt;xs:sequence&gt;
      &lt;xs:element name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
      &lt;xs:element name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
    &lt;/xs:sequence&gt;
  &lt;/xs:complexType&gt;
&lt;/xs:element&gt;</pre>
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<p>If you use the method described above, only the &quot;employee&quot; element can use the 
specified 
complex type. Note that the child elements, &quot;firstname&quot; and &quot;lastname&quot;, are surrounded 
by the &lt;sequence&gt; indicator. This means that the child elements must appear in 
the same order as they are declared. You 
will learn more about indicators in the XSD Indicators chapter.</p>
<p>2. The &quot;employee&quot; element can have a type attribute that refers 
to the name 
of the complex type to use:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;xs:element name=&quot;employee&quot; type=&quot;personinfo&quot;/&gt;</pre>
      <pre>&lt;xs:complexType name=&quot;personinfo&quot;&gt;
  &lt;xs:sequence&gt;
    &lt;xs:element name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
    &lt;xs:element name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;</pre>
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<p>If you use the method described above, several elements can refer to the same 
complex type, like this:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;xs:element name=&quot;employee&quot; type=&quot;personinfo&quot;/&gt;
&lt;xs:element name=&quot;student&quot; type=&quot;personinfo&quot;/&gt;
&lt;xs:element name=&quot;member&quot; type=&quot;personinfo&quot;/&gt;</pre>
      <pre>&lt;xs:complexType name=&quot;personinfo&quot;&gt;
  &lt;xs:sequence&gt;
    &lt;xs:element name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
    &lt;xs:element name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;</pre>
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<p>You can also base a complex element on an existing complex element and add some 
elements, like this:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;xs:element name=&quot;employee&quot; type=&quot;fullpersoninfo&quot;/&gt;</pre>
      <pre>&lt;xs:complexType name=&quot;personinfo&quot;&gt;
  &lt;xs:sequence&gt;
    &lt;xs:element name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
    &lt;xs:element name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;</pre>
      <pre>&lt;xs:complexType name=&quot;fullpersoninfo&quot;&gt;
  &lt;xs:complexContent&gt;
    &lt;xs:extension base=&quot;personinfo&quot;&gt;
      &lt;xs:sequence&gt;
        &lt;xs:element name=&quot;address&quot; type=&quot;xs:string&quot;/&gt;
        &lt;xs:element name=&quot;city&quot; type=&quot;xs:string&quot;/&gt;
        &lt;xs:element name=&quot;country&quot; type=&quot;xs:string&quot;/&gt;
      &lt;/xs:sequence&gt;
    &lt;/xs:extension&gt;
  &lt;/xs:complexContent&gt;
&lt;/xs:complexType&gt;</pre>
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