<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://acme.com/purchase-order/2005/08"
  xmlns:tns="http://acme.com/purchase-order/2005/08"
  elementFormDefault="qualified">
 
  <xsd:annotation>
    <xsd:documentation xml:lang="en">
     Purchase order schema for Acme.com.
     Copyright 2005 Acme.com. All rights reserved.
    </xsd:documentation>
  </xsd:annotation>

  <xsd:element name="PurchaseOrder" type="tns:PurchaseOrderType"/>

  <xsd:element name="Comment" type="xsd:string"/>

  <xsd:element name="PurchaseOrderId" type="xsd:long"/>
  
  <xsd:complexType name="PurchaseOrderType">
    <xsd:sequence>
      <xsd:element ref="tns:PurchaseOrderId"/>
      <xsd:element name="ShipTo" type="tns:Address"/>
      <xsd:element name="BillTo" type="tns:Address"/>
      <xsd:element minOccurs="0" ref="tns:Comment"/>
      <xsd:element name="Items" type="tns:Items"/>
    </xsd:sequence>
    <xsd:attribute name="orderDate" type="xsd:date"/>
  </xsd:complexType>

  <xsd:complexType name="Address">
    <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="PostalCode" type="xsd:decimal"/>
    </xsd:sequence>
    <xsd:attribute fixed="US" name="Country" type="xsd:NMTOKEN"/>
  </xsd:complexType>

  <xsd:complexType name="Items">
    <xsd:sequence>
      <xsd:element maxOccurs="unbounded" minOccurs="0" name="item">
        <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 minOccurs="0" ref="tns:Comment"/>
            <xsd:element minOccurs="0" name="ShipDate" type="xsd:date"/>
          </xsd:sequence>
          <xsd:attribute name="PartNum" type="tns: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>