1  <?xml version="1.0"?>
 2  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 3    <xs:complexType name="personName">
 4      <xs:sequence>
 5        <xs:element name="title" minOccurs="0"/>
 6        <xs:element name="forename" minOccurs="0" maxOccurs="unbounded"/>
 7        <xs:element name="surname"/>
 8      </xs:sequence>
 9    </xs:complexType>
10    <xs:complexType name="simpleName">
11      <xs:complexContent>
12        <xs:restriction base="personName">
13          <xs:sequence>
14            <xs:element name="forename" minOccurs="1" maxOccurs="1"/>
15            <xs:element name="surname"/>
16          </xs:sequence>
17        </xs:restriction>
18      </xs:complexContent>
19    </xs:complexType>
20    <xs:element name="who" type="simpleName"/>
21  </xs:schema>