XML Complex Types

• We can define a schema for phone numbers that are just three group of numbers.

<?xml version="1.0" encoding="ISO-8859-1"?>

<!-- A telephone number contains three parts-->
<!-- This is the schema -->
<xsd:complexType name="telephoneNumber">
  <xsd:sequence>
    <xsd:element name="area">
      <xsd:simpleType>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="\d{3}"/>
        </xsd:restriction>
      </xsd:simpleType>
    </xsd:element>
    <xsd:element name="exchange">
      <xsd:simpleType>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="\d{3}"/>
        </xsd:restriction>
      </xsd:simpleType>
    </xsd:element>
    <xsd:element name="number">
      <xsd:simpleType>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="\d{4}"/>
        </xsd:restriction>
      </xsd:simpleType>
    </xsd:element>
  </xsd:sequence>
</xsd:complexType>

<!--An instance of this phonenumber would look like-->
<telephone xsi:type="abc:telephoneNumber">
  <area>123</area>
  <exchange>123</exchange>
  <number>1234</number>
</telephone>