.NET Shell Extensions - Shell Icon Overlay Handlers

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://tempuri.org/po.xsd"
xmlns="http://tempuri.org/po.xsd" elementFormDefault="qualified">
  <xs:annotation>
    <xs:documentation xml:lang="en">
      Purchase order schema for Example.com.
      Copyright 2000 Example.com. All rights reserved.
    </xs:documentation>
  </xs:annotation>

  <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:annotation>
      <xs:documentation>
        Purchase order schema for Example.Microsoft.com.
        Copyright 2001 Example.Microsoft.com. All rights reserved.
      </xs:documentation>
      <xs:appinfo>
        Application info.
      </xs:appinfo>
    </xs:annotation>

    <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="xs:string"/>
      <xs:element name="zip"    type="xs:decimal"/>
    </xs:sequence>
    <xs:attribute name="country" type="xs:NMTOKEN"
       fixed="US"/>
  </xs:complexType>

  <xs:complexType name="Items">
    <xs:sequence>
      <xs:element name="item" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="productName" type="xs:string"/>
            <xs:element name="quantity">
              <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:schema>