Subtyping in XML Schema

<schema version=“1.0” xmlns=“http://www.w3.org/1999/XMLSchema”>

<type name=“person”>

<attribute name=“ssn”>

<element name=“title” minOccurs=“0” maxOccurs=“1” />

<element name=“surname” />

<element name=“forename” minOccurs=“0” maxOccurs=“*” />

</type>

<type name=“extended” source=“person” derivedBy=“extension”>

<element name=“generation” minOccurs=“0” />

</type>

<type name=“notitle” source=“person” derivedBy=“restriction”>

<element name=“title” maxOccurs=“0” />

</type>

<key name=“personKey”>

<selector>.//person[@ssn]</selector>

<field>@ssn</field>

</key>

</schema>

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