<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element type="pricingengines" name="PricingEngines"/>

  <xs:complexType name="pricingengines">
    <xs:sequence>
      <xs:element type="product" name="Product" maxOccurs="unbounded" minOccurs="0"/>
      <xs:element type="globalParameters" name="GlobalParameters" minOccurs="0"/>
      <!-- FIXME: poor name -->
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="product">
    <xs:all>
      <xs:element type="xs:string" name="Model"/>
      <xs:element name="ModelParameters">
        <xs:complexType>
          <xs:sequence>
            <xs:element type="parameter" name="Parameter" maxOccurs="unbounded" minOccurs="0"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element type="xs:string" name="Engine"/>
      <xs:element name="EngineParameters">
        <xs:complexType>
          <xs:sequence>
            <xs:element type="parameter" name="Parameter" maxOccurs="unbounded" minOccurs="0"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:all>
    <xs:attribute type="xs:string" name="type" use="required"/>
  </xs:complexType>

  <xs:complexType name="globalParameters">
    <xs:sequence>
      <xs:element type="parameter" name="Parameter" maxOccurs="unbounded" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="parameter">
    <!-- parameter with attribute -->
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute type="xs:string" name="name" use="required"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

</xs:schema>