schema_complex_indicators.asp

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<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;</pre>
      <pre>&lt;persons xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
xsi:noNamespaceSchemaLocation=&quot;family.xsd&quot;&gt;</pre>
      <pre>&lt;person&gt;
&lt;full_name&gt;Hege Refsnes&lt;/full_name&gt;
&lt;child_name&gt;Cecilie&lt;/child_name&gt;
&lt;/person&gt;</pre>
      <pre>&lt;person&gt;
&lt;full_name&gt;Tove Refsnes&lt;/full_name&gt;
&lt;child_name&gt;Hege&lt;/child_name&gt;
&lt;child_name&gt;Stale&lt;/child_name&gt;
&lt;child_name&gt;Jim&lt;/child_name&gt;
&lt;child_name&gt;Borge&lt;/child_name&gt;
&lt;/person&gt;</pre>
      <pre>&lt;person&gt;
&lt;full_name&gt;Stale Refsnes&lt;/full_name&gt;
&lt;/person&gt;</pre>
      <pre>&lt;/persons&gt;</pre>
    </td>
  </tr>
</table>

<p>The XML file above contains a root element named &quot;persons&quot;. Inside 
this root element we have defined three &quot;person&quot; elements. Each &quot;person&quot; element must 
contain a &quot;full_name&quot; element and it can contain up to five &quot;child_name&quot; elements.</p>

<p>Here is the schema file &quot;family.xsd&quot;:</p>

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  <tr>
    <td>
      <pre>&lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;
&lt;xs:schema xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;
elementFormDefault=&quot;qualified&quot;&gt;</pre>
      <pre>&lt;xs:element name=&quot;persons&quot;&gt;
  &lt;xs:complexType&gt;
    &lt;xs:sequence&gt;
      &lt;xs:element name=&quot;person&quot; maxOccurs=&quot;unbounded&quot;&gt;
        &lt;xs:complexType&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element name=&quot;full_name&quot; type=&quot;xs:string&quot;/&gt;
            &lt;xs:element name=&quot;child_name&quot; type=&quot;xs:string&quot;
            minOccurs=&quot;0&quot; maxOccurs=&quot;5&quot;/&gt;
          &lt;/xs:sequence&gt;
        &lt;/xs:complexType&gt;
      &lt;/xs:element&gt;
    &lt;/xs:sequence&gt;
  &lt;/xs:complexType&gt;
&lt;/xs:element&gt;</pre>
      <pre>&lt;/xs:schema&gt;</pre>
    </td>
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<br />
<hr />

<h2>Group Indicators</h2>
<p>Group indicators are used to define related sets of elements.</p>
<p><b>Element Groups</b></p>
<p>Element groups are defined with the group declaration, like this:</p>
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  <tr>
    <td>
      <pre>&lt;xs:group name=&quot;groupname&quot;&gt;
  ...
&lt;/xs:group&gt;</pre>
    </td>
  </tr>
</table>

<p>You must define an all, choice, or sequence element inside the group 
declaration. The following example defines a group named &quot;persongroup&quot;, that 
defines a group of elements that must occur in an exact sequence:</p>

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  <tr>
    <td>
      <pre>&lt;xs:group name=&quot;persongroup&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:element name=&quot;birthday&quot; type=&quot;xs:date&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:group&gt;</pre>
    </td>
  </tr>
</table>

<p>After you have defined a group, you can reference it in another definition, like this:</p>

<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;xs:group name=&quot;persongroup&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:element name=&quot;birthday&quot; type=&quot;xs:date&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:group&gt;</pre>
      <pre>&lt;xs:element name=&quot;person&quot; type=&quot;personinfo&quot;/&gt;</pre>
      <pre>&lt;xs:complexType name=&quot;personinfo&quot;&gt;
  &lt;xs:sequence&gt;
    &lt;xs:group ref=&quot;persongroup&quot;/&gt;
    &lt;xs:element name=&quot;country&quot; type=&quot;xs:string&quot;/&gt;
  &lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;</pre>
    </td>
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<p><b>Attribute Groups</b></p>

<p>Attribute groups are defined with the attributeGroup declaration, like this:</p>
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  <tr>
    <td>
      <pre>&lt;xs:attributeGroup name=&quot;groupname&quot;&gt;
  ...
&lt;/xs:attributeGroup&gt;</pre>
    </td>
  </tr>
</table>

<p>The following example defines an attribute group named &quot;personattrgroup&quot;:</p>

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  <tr>
    <td>
      <pre>&lt;xs:attributeGroup name=&quot;personattrgroup&quot;&gt;
  &lt;xs:attribute name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;xs:attribute name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;xs:attribute name=&quot;birthday&quot; type=&quot;xs:date&quot;/&gt;
&lt;/xs:attributeGroup&gt;</pre>
    </td>
  </tr>
</table>

<p>After you have defined an attribute group, you can reference it in another 
definition, like this:</p>

<table width="100%" border="1" class="ex" cellspacing="0">
  <tr>
    <td>
      <pre>&lt;xs:attributeGroup name=&quot;personattrgroup&quot;&gt;
  &lt;xs:attribute name=&quot;firstname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;xs:attribute name=&quot;lastname&quot; type=&quot;xs:string&quot;/&gt;
  &lt;xs:attribute name=&quot;birthday&quot; type=&quot;xs:date&quot;/&gt;
&lt;/xs:attributeGroup&gt;</pre>
      <pre>&lt;xs:element name=&quot;person&quot;&gt;
  &lt;xs:complexType&gt;
    &lt;xs:attributeGroup ref=&quot;personattrgroup&quot;/&gt;
  &lt;/xs:complexType&gt;
&lt;/xs:element&gt;</pre>
    </td>
  </tr>
</table>
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