1<?xml version="1.0"?>
2<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
3  <xsd:annotation>
4    <xsd:documentation xml:lang="en">
5Purchase order schema for Example.com.
6   Copyright 2000 Example.com. All rights reserved.
7    </xsd:documentation>
8  </xsd:annotation>
9  <xsd:element name="purchaseOrder" type="PurchaseOrderType"/>
10  <xsd:element name="comment" type="xsd:string"/>
11  <xsd:complexType name="PurchaseOrderType">
12    <xsd:sequence>
13      <xsd:element name="shipTo" type="USAddress"/>
14      <xsd:element name="billTo" type="USAddress"/>
15      <xsd:element ref="comment" minOccurs="0"/>
16      <xsd:element name="items" type="Items"/>
17    </xsd:sequence>
18    <xsd:attribute name="orderDate" type="xsd:date"/>
19  </xsd:complexType>
20  <xsd:complexType name="USAddress">
21    <xsd:sequence>
22      <xsd:element name="name" type="xsd:string"/>
23      <xsd:element name="street" type="xsd:string"/>
24      <xsd:element name="city" type="xsd:string"/>
25      <xsd:element name="state" type="xsd:string"/>
26      <xsd:element name="zip" type="xsd:decimal"/>
27    </xsd:sequence>
28    <xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US"/>
29  </xsd:complexType>
30  <xsd:complexType name="Items">
31    <xsd:sequence>
32      <xsd:element name="item" minOccurs="0" maxOccurs="unbounded">
33        <xsd:complexType>
34          <xsd:sequence>
35            <xsd:element name="productName" type="xsd:string"/>
36            <xsd:element name="quantity">
37              <xsd:simpleType>
38                <xsd:restriction base="xsd:positiveInteger">
39                  <xsd:maxExclusive value="100"/>
40                </xsd:restriction>
41              </xsd:simpleType>
42            </xsd:element>
43            <xsd:element name="USPrice" type="xsd:decimal"/>
44            <xsd:element ref="comment" minOccurs="0"/>
45            <xsd:element name="shipDate" type="xsd:date" minOccurs="0"/>
46          </xsd:sequence>
47          <xsd:attribute name="partNum" type="SKU" use="required"/>
48        </xsd:complexType>
49      </xsd:element>
50    </xsd:sequence>
51  </xsd:complexType>
52<!-- Stock Keeping Unit, a code for identifying products -->
53  <xsd:simpleType name="SKU">
54    <xsd:restriction base="xsd:string">
55      <xsd:pattern value="\d{3}-[A-Z]{2}"/>
56    </xsd:restriction>
57  </xsd:simpleType>
58</xsd:schema>
59
60