Listing A

<?xml version="1.0"?>

<schema:schema xmlns:schema="http://www.w3.org/2001/XMLSchema">

   <schema:element name="person">

       <schema:complexType>

          <schema:sequence>

              <schema:element name="name" type="schema:string" />

              <schema:element name="age" type="schema:positiveInteger" />

              <schema:element name="color" type="schema:string" />

          </schema:sequence>

       </schema:complexType>

    </schema:element>

    <schema:element name="description" type="schema:string" />

</schema:schema>