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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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  <xsd:annotation>

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    <xsd:documentation xml:lang="en">

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      Purchase order schema for Example.com.

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      Copyright 2000 Example.com. All rights reserved.

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    </xsd:documentation>

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  </xsd:annotation>

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  <xsd:element name="purchaseOrder" type="PurchaseOrderType"/>

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

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  <xsd:complexType name="PurchaseOrderType">

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    <xsd:sequence>

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      <xsd:element name="shipTo" type="USAddress"/>

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      <xsd:element name="billTo" type="USAddress"/>

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      <xsd:element ref="comment" minOccurs="0"/>

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      <xsd:element name="items"  type="Items"/>

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    </xsd:sequence>

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    <xsd:attribute name="orderDate" type="xsd:date"/>

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  </xsd:complexType>

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  <xsd:complexType name="USAddress">

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    <xsd:sequence>

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

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

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

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

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      <xsd:element name="zip"    type="xsd:decimal"/>

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    </xsd:sequence>

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    <xsd:attribute name="country" type="xsd:NMTOKEN"

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                   fixed="US"/>

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  </xsd:complexType>

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  <xsd:complexType name="Items">

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    <xsd:sequence>

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      <xsd:element name="item" minOccurs="0" maxOccurs="unbounded">

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        <xsd:complexType>

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          <xsd:sequence>

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

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            <xsd:element name="quantity">

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              <xsd:simpleType>

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                <xsd:restriction base="xsd:positiveInteger">

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                  <xsd:maxExclusive value="100"/>

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                </xsd:restriction>

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              </xsd:simpleType>

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            </xsd:element>

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            <xsd:element name="USPrice"  type="xsd:decimal"/>

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            <xsd:element ref="comment"   minOccurs="0"/>

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            <xsd:element name="shipDate" type="xsd:date" minOccurs="0"/>

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          </xsd:sequence>

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          <xsd:attribute name="partNum" type="SKU" use="required"/>

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        </xsd:complexType>

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      </xsd:element>

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    </xsd:sequence>

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  </xsd:complexType>

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  <!-- Stock Keeping Unit, a code for identifying products -->

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  <xsd:simpleType name="SKU">

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    <xsd:restriction base="xsd:string">

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      <xsd:pattern value="\d{3}-[A-Z]{2}"/>

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    </xsd:restriction>

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  </xsd:simpleType>

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</xsd:schema>