<?xml version="1.0" encoding="ISO-8859-1" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:annotation>
    <xsd:documentation xml:lang="en">Purchase order schema for Example.com.
     Copyright 2000 Example.com. All rights reserved.</xsd:documentation>
  </xsd:annotation>
  <xsd:element name="purchaseOrder" type="PurchaseOrderType" />
  <xsd:element name="comment" type="xsd:string" />
  <xsd:complexType name="PurchaseOrderType">
    <xsd:sequence>
      <xsd:element name="shipTo" type="USAddress" />
      <xsd:element name="billTo" type="USAddress" />
      <xsd:element ref="comment" minOccurs="0" />
      <xsd:element name="items" type="Items" />
    </xsd:sequence>
    <xsd:attribute name="orderDate" type="xsd:date" />
  </xsd:complexType>
  <xsd:complexType name="USAddress">
    <xsd:sequence>
      <xsd:element name="name" type="xsd:string" />
      <xsd:element name="street" type="xsd:string" />
      <xsd:element name="city" type="xsd:string" />
      <xsd:element name="state" type="xsd:string" />
      <xsd:element name="zip" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US" />
  </xsd:complexType>
  <xsd:complexType name="Items">
    <xsd:sequence>
      <xsd:element name="item" minOccurs="0" maxOccurs="unbounded">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="productName" type="xsd:string" />
            <xsd:element name="quantity">
              <xsd:simpleType>
                <xsd:restriction base="xsd:positiveInteger">
                  <xsd:maxExclusive value="100" />
                </xsd:restriction>
              </xsd:simpleType>
            </xsd:element>
            <xsd:element name="USPrice" type="xsd:decimal" />
            <xsd:element ref="comment" minOccurs="0" />
            <xsd:element name="shipDate" type="xsd:date" minOccurs="0" />
          </xsd:sequence>
          <xsd:attribute name="partNum" type="SKU" use="required" />
        </xsd:complexType>
      </xsd:element>
    </xsd:sequence>
  </xsd:complexType>
  <!-- Stock Keeping Unit, a code for identifying products -->
  <xsd:simpleType name="SKU">
    <xsd:restriction base="xsd:string">
      <xsd:pattern value="\d{3}-[A-Z]{2}" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>
