示例 XSD 文件：客户和订单 (LINQ to XML)

下列 XSD 文件用在 LINQ to XML 文档的很多示例中。 此文件包含示例 XML 文件：客户和订单的架构定义。 架构使用 XSD 的 xs:key 和 xs:keyref 功能将 CustomerID 元素的 Customer 属性设置为键，并在每个 CustomerID 元素的 Order 元素和每个 CustomerID 元素的 Customer 属性之间建立关系。

有关使用 Join 子句编写利用此关系的 LINQ 查询的示例，请参阅如何联接两个集合。

CustomersOrders.xsd

<?xml version="1.0" encoding="utf-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name='Root'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='Customers'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='Customer' type='CustomerType' minOccurs='0' maxOccurs='unbounded' />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name='Orders'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='Order' type='OrderType' minOccurs='0' maxOccurs='unbounded' />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
    <xs:key name='CustomerIDKey'>
      <xs:selector xpath='Customers/Customer'/>
      <xs:field xpath='@CustomerID'/>
    </xs:key>
    <xs:keyref name='CustomerIDKeyRef' refer='CustomerIDKey'>
      <xs:selector xpath='Orders/Order'/>
      <xs:field xpath='CustomerID'/>
    </xs:keyref>
  </xs:element>
  <xs:complexType name='CustomerType'>
    <xs:sequence>
      <xs:element name='CompanyName' type='xs:string'/>
      <xs:element name='ContactName' type='xs:string'/>
      <xs:element name='ContactTitle' type='xs:string'/>
      <xs:element name='Phone' type='xs:string'/>
      <xs:element name='Fax' minOccurs='0' type='xs:string'/>
      <xs:element name='FullAddress' type='AddressType'/>
    </xs:sequence>
    <xs:attribute name='CustomerID' type='xs:token'/>
  </xs:complexType>
  <xs:complexType name='AddressType'>
    <xs:sequence>
      <xs:element name='Address' type='xs:string'/>
      <xs:element name='City' type='xs:string'/>
      <xs:element name='Region' type='xs:string'/>
      <xs:element name='PostalCode' type='xs:string' />
      <xs:element name='Country' type='xs:string'/>
    </xs:sequence>
    <xs:attribute name='CustomerID' type='xs:token'/>
  </xs:complexType>
  <xs:complexType name='OrderType'>
    <xs:sequence>
      <xs:element name='CustomerID' type='xs:token'/>
      <xs:element name='EmployeeID' type='xs:token'/>
      <xs:element name='OrderDate' type='xs:dateTime'/>
      <xs:element name='RequiredDate' type='xs:dateTime'/>
      <xs:element name='ShipInfo' type='ShipInfoType'/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='ShipInfoType'>
    <xs:sequence>
      <xs:element name='ShipVia' type='xs:integer'/>
      <xs:element name='Freight' type='xs:decimal'/>
      <xs:element name='ShipName' type='xs:string'/>
      <xs:element name='ShipAddress' type='xs:string'/>
      <xs:element name='ShipCity' type='xs:string'/>
      <xs:element name='ShipRegion' type='xs:string'/>
      <xs:element name='ShipPostalCode' type='xs:string'/>
      <xs:element name='ShipCountry' type='xs:string'/>
    </xs:sequence>
    <xs:attribute name='ShippedDate' type='xs:dateTime'/>
  </xs:complexType>
</xs:schema>