po.xsd

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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="purchaseOrder" type="PurchaseOrderType"/>
<xs:element name="comment" type="xs:string"/>
<xs:complexType name="PurchaseOrderType">
  <xs:sequence>
    <xs:element name="shipTo" type="USAddress"/>
    <xs:element name="billTo" type="USAddress"/>
    <xs:element ref="comment" minOccurs="0"/>
    <xs:element name="items" type="Items"/>
  </xs:sequence>
  <xs:attribute name="orderDate" type="xs:date"/>
</xs:complexType>

<xs:complexType name="USAddress">
  <xs:sequence>
    <xs:element name="name" type="xs:string"/>
    <xs:element name="street" type="xs:string"/>
    <xs:element name="city" type="xs:string"/>
    <xs:element name="state" type="USState"/>
    <xs:element name="zip" type="ZipCodeType"/>
  </xs:sequence>
  <xs:attribute name="country" type="xs:NMTOKEN" fixed="US"/>
</xs:complexType>

<xs:complexType name="Items">
  <xs:sequence>
    <xs:element name="item" minOccurs="1" maxOccurs="unbounded">
      <xs:complexType>
        <xs:sequence>
         <xs:element name="productName" type="xs:string"/>
         <xs:element name="quantity" default="10">
           <xs:simpleType>
             <xs:restriction base="xs:positiveInteger">
               <xs:maxExclusive value="100"/>
             </xs:restriction>
           </xs:simpleType>
         </xs:element>
         <xs:element name="USPrice" type="xs:decimal"/>
         <xs:element ref="comment" minOccurs="0"/>
         <xs:element name="shipDate" type="xs:date" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="partNum" type="SKU" use="required"/>
      </xs:complexType>
    </xs:element>
  </xs:sequence>
</xs:complexType>

<!-- Stock Keeping Unit, a code for identifying products -->
<xs:simpleType name="SKU">
  <xs:restriction base="xs:string">
     <xs:pattern value="\d{3}-[A-Z]{2}"/>
  </xs:restriction>
</xs:simpleType>


<xs:simpleType name="USState">
  <xs:restriction base="xs:string">
    <xs:enumeration value="AK"/>
    <xs:enumeration value="AL"/>
    <xs:enumeration value="AR"/>
    <xs:enumeration value="CA"/>
    <xs:enumeration value="MA"/>
    <!-- and so on ... -->
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="ZipCodeType">
  <xs:restriction base="xs:integer">
    <xs:minInclusive value="10000"/>
    <xs:maxInclusive value="99999"/>
  </xs:restriction>
</xs:simpleType>
</xs:schema>