<?xml version=“1.0”?> <xsd:schema xmlns:xsd=“www.w3.org/2001/XMLSchema”>

<xsd:complexType name="PurchaseOrderType">
  <xsd:sequence>
    <xsd:all>
      <xsd:element name="shipTo" type="USAddress"/>
      <xsd:element name="billTo" type="USAddress"/>
      <xsd:element name="items" type="Items"/>
    </xsd:all>
    <xsd:sequence>
      <xsd:element ref="comment" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:sequence>
  <xsd:attribute name="orderDate" type="xsd:date"/>
</xsd:complexType>

</xsd:schema>