W3C  XML

Example 1

Here is a sample schema written in W3C XML Schema syntax. 

<xsd:schema targetNamespace = "http://www.example.com/baz.xsd"
    xmlns = "http://www.example.com/baz.xsd"
    xmlns:xsd = "http://www.w3.org/2001/XMLSchema">
  <xsd:element name="a" type="t"/>
  <xsd:simpleType name="b">
    <xsd:list itemType="xsd:integer"/>
  </xsd:simpleType>
  <xsd:complexType name="t">
    <xsd:attribute name="b" type="xsd:string"/>
    <xsd:attribute name="c" type="b" use="optional"/>
  </xsd:complexType>
  <xsd:complexType name="u">
    <xsd:complexContent>
      <xsd:extension base="t">
        <xsd:choice>
          <xsd:element name="d">
            <xsd:complexType>
              <xsd:sequence>
                <xsd:element name="a"
                    type="xsd:string"
                    minOccurs="1"
                    maxOccurs="unbounded"/>

              </xsd:sequence>
            </xsd:complexType>
          </xsd:element>
          <xsd:element name="e" type="xsd:string"/>
        </xsd:choice>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
</xsd:schema>