示例 XML 文件：Customers 和 Orders (LINQ to XML)
LINQ to XML 文档中的多个示例都使用下面的 XML 文件。 此文件包含客户和订单。
示例 XSD 文件：客户和订单主题包含一个用于验证此文档的 XSD。 它使用 XSD 的 xs:key 和 xs:keyref 功能，将 Customer 元素的 CustomerID 属性设置为键，并在每个 Order 元素的 CustomerID 元素和每个 Customer 元素的CustomerID 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，请参见如何：联接两个集合 (C#) (LINQ to XML)。
CustomersOrders.xml
<?xml version="1.0" encoding="utf-8"?>
<Root>
<Customers>
<Customer CustomerID="GREAL">
<CompanyName>Great Lakes Food Market</CompanyName>
<ContactName>Howard Snyder</ContactName>
<ContactTitle>Marketing Manager</ContactTitle>
<Phone>(503) 555-7555</Phone>
<FullAddress>
<Address>2732 Baker Blvd.</Address>
<City>Eugene</City>
<Region>OR</Region>
<PostalCode>97403</PostalCode>
<Country>USA</Country>
</FullAddress>
</Customer>
<Customer CustomerID="HUNGC">
<CompanyName>Hungry Coyote Import Store</CompanyName>
<ContactName>Yoshi Latimer</ContactName>
<ContactTitle>Sales Representative</ContactTitle>
<Phone>(503) 555-6874</Phone>
<Fax>(503) 555-2376</Fax>
<FullAddress>
<Address>City Center Plaza 516 Main St.</Address>
<City>Elgin</City>
<Region>OR</Region>
<PostalCode>97827</PostalCode>
<Country>USA</Country>
</FullAddress>
</Customer>
<Customer CustomerID="LAZYK">
<CompanyName>Lazy K Kountry Store</CompanyName>
<ContactName>John Steel</ContactName>
<ContactTitle>Marketing Manager</ContactTitle>
<Phone>(509) 555-7969</Phone>
<Fax>(509) 555-6221</Fax>
<FullAddress>
<Address>12 Orchestra Terrace</Address>
<City>Walla Walla</City>
<Region>WA</Region>
<PostalCode>99362</PostalCode>
<Country>USA</Country>
</FullAddress>
</Customer>
<Customer CustomerID="LETSS">
<CompanyName>Let's Stop N Shop</CompanyName>
<ContactName>Jaime Yorres</ContactName>
<ContactTitle>Owner</ContactTitle>
<Phone>(415) 555-5938</Phone>
<FullAddress>
<Address>87 Polk St. Suite 5</Address>
<City>San Francisco</City>
<Region>CA</Region>
<PostalCode>94117</PostalCode>
<Country>USA</Country>
</FullAddress>
</Customer>
</Customers>
<Orders>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>6</EmployeeID>
<OrderDate>1997-05-06T00:00:00</OrderDate>
<RequiredDate>1997-05-20T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-05-09T00:00:00">
<ShipVia>2</ShipVia>
<Freight>3.35</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>8</EmployeeID>
<OrderDate>1997-07-04T00:00:00</OrderDate>
<RequiredDate>1997-08-01T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-07-14T00:00:00">
<ShipVia>2</ShipVia>
<Freight>4.42</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>1</EmployeeID>
<OrderDate>1997-07-31T00:00:00</OrderDate>
<RequiredDate>1997-08-28T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-08-05T00:00:00">
<ShipVia>2</ShipVia>
<Freight>116.53</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1997-07-31T00:00:00</OrderDate>
<RequiredDate>1997-08-28T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-08-04T00:00:00">
<ShipVia>2</ShipVia>
<Freight>18.53</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>6</EmployeeID>
<OrderDate>1997-09-04T00:00:00</OrderDate>
<RequiredDate>1997-10-02T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-09-10T00:00:00">
<ShipVia>1</ShipVia>
<Freight>57.15</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>3</EmployeeID>
<OrderDate>1997-09-25T00:00:00</OrderDate>
<RequiredDate>1997-10-23T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-09-30T00:00:00">
<ShipVia>3</ShipVia>
<Freight>76.13</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1998-01-06T00:00:00</OrderDate>
<RequiredDate>1998-02-03T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1998-02-04T00:00:00">
<ShipVia>2</ShipVia>
<Freight>719.78</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>3</EmployeeID>
<OrderDate>1998-03-09T00:00:00</OrderDate>
<RequiredDate>1998-04-06T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1998-03-18T00:00:00">
<ShipVia>2</ShipVia>
<Freight>33.68</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>3</EmployeeID>
<OrderDate>1998-04-07T00:00:00</OrderDate>
<RequiredDate>1998-05-05T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1998-04-15T00:00:00">
<ShipVia>2</ShipVia>
<Freight>25.19</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1998-04-22T00:00:00</OrderDate>
<RequiredDate>1998-05-20T00:00:00</RequiredDate>
<ShipInfo>
<ShipVia>3</ShipVia>
<Freight>18.84</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>GREAL</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1998-04-30T00:00:00</OrderDate>
<RequiredDate>1998-06-11T00:00:00</RequiredDate>
<ShipInfo>
<ShipVia>3</ShipVia>
<Freight>14.01</Freight>
<ShipName>Great Lakes Food Market</ShipName>
<ShipAddress>2732 Baker Blvd.</ShipAddress>
<ShipCity>Eugene</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97403</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>HUNGC</CustomerID>
<EmployeeID>3</EmployeeID>
<OrderDate>1996-12-06T00:00:00</OrderDate>
<RequiredDate>1997-01-03T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1996-12-09T00:00:00">
<ShipVia>2</ShipVia>
<Freight>20.12</Freight>
<ShipName>Hungry Coyote Import Store</ShipName>
<ShipAddress>City Center Plaza 516 Main St.</ShipAddress>
<ShipCity>Elgin</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97827</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>HUNGC</CustomerID>
<EmployeeID>1</EmployeeID>
<OrderDate>1996-12-25T00:00:00</OrderDate>
<RequiredDate>1997-01-22T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-01-03T00:00:00">
<ShipVia>3</ShipVia>
<Freight>30.34</Freight>
<ShipName>Hungry Coyote Import Store</ShipName>
<ShipAddress>City Center Plaza 516 Main St.</ShipAddress>
<ShipCity>Elgin</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97827</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>HUNGC</CustomerID>
<EmployeeID>3</EmployeeID>
<OrderDate>1997-01-15T00:00:00</OrderDate>
<RequiredDate>1997-02-12T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-01-24T00:00:00">
<ShipVia>1</ShipVia>
<Freight>0.2</Freight>
<ShipName>Hungry Coyote Import Store</ShipName>
<ShipAddress>City Center Plaza 516 Main St.</ShipAddress>
<ShipCity>Elgin</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97827</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>HUNGC</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1997-07-16T00:00:00</OrderDate>
<RequiredDate>1997-08-13T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-07-21T00:00:00">
<ShipVia>1</ShipVia>
<Freight>45.13</Freight>
<ShipName>Hungry Coyote Import Store</ShipName>
<ShipAddress>City Center Plaza 516 Main St.</ShipAddress>
<ShipCity>Elgin</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97827</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>HUNGC</CustomerID>
<EmployeeID>8</EmployeeID>
<OrderDate>1997-09-08T00:00:00</OrderDate>
<RequiredDate>1997-10-06T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-10-15T00:00:00">
<ShipVia>1</ShipVia>
<Freight>111.29</Freight>
<ShipName>Hungry Coyote Import Store</ShipName>
<ShipAddress>City Center Plaza 516 Main St.</ShipAddress>
<ShipCity>Elgin</ShipCity>
<ShipRegion>OR</ShipRegion>
<ShipPostalCode>97827</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LAZYK</CustomerID>
<EmployeeID>1</EmployeeID>
<OrderDate>1997-03-21T00:00:00</OrderDate>
<RequiredDate>1997-04-18T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-04-10T00:00:00">
<ShipVia>3</ShipVia>
<Freight>7.48</Freight>
<ShipName>Lazy K Kountry Store</ShipName>
<ShipAddress>12 Orchestra Terrace</ShipAddress>
<ShipCity>Walla Walla</ShipCity>
<ShipRegion>WA</ShipRegion>
<ShipPostalCode>99362</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LAZYK</CustomerID>
<EmployeeID>8</EmployeeID>
<OrderDate>1997-05-22T00:00:00</OrderDate>
<RequiredDate>1997-06-19T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-06-26T00:00:00">
<ShipVia>2</ShipVia>
<Freight>11.92</Freight>
<ShipName>Lazy K Kountry Store</ShipName>
<ShipAddress>12 Orchestra Terrace</ShipAddress>
<ShipCity>Walla Walla</ShipCity>
<ShipRegion>WA</ShipRegion>
<ShipPostalCode>99362</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LETSS</CustomerID>
<EmployeeID>1</EmployeeID>
<OrderDate>1997-06-25T00:00:00</OrderDate>
<RequiredDate>1997-07-23T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-07-04T00:00:00">
<ShipVia>2</ShipVia>
<Freight>13.73</Freight>
<ShipName>Let's Stop N Shop</ShipName>
<ShipAddress>87 Polk St. Suite 5</ShipAddress>
<ShipCity>San Francisco</ShipCity>
<ShipRegion>CA</ShipRegion>
<ShipPostalCode>94117</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LETSS</CustomerID>
<EmployeeID>8</EmployeeID>
<OrderDate>1997-10-27T00:00:00</OrderDate>
<RequiredDate>1997-11-24T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-11-05T00:00:00">
<ShipVia>2</ShipVia>
<Freight>51.44</Freight>
<ShipName>Let's Stop N Shop</ShipName>
<ShipAddress>87 Polk St. Suite 5</ShipAddress>
<ShipCity>San Francisco</ShipCity>
<ShipRegion>CA</ShipRegion>
<ShipPostalCode>94117</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LETSS</CustomerID>
<EmployeeID>6</EmployeeID>
<OrderDate>1997-11-10T00:00:00</OrderDate>
<RequiredDate>1997-12-08T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1997-11-21T00:00:00">
<ShipVia>2</ShipVia>
<Freight>45.97</Freight>
<ShipName>Let's Stop N Shop</ShipName>
<ShipAddress>87 Polk St. Suite 5</ShipAddress>
<ShipCity>San Francisco</ShipCity>
<ShipRegion>CA</ShipRegion>
<ShipPostalCode>94117</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
<Order>
<CustomerID>LETSS</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>1998-02-12T00:00:00</OrderDate>
<RequiredDate>1998-03-12T00:00:00</RequiredDate>
<ShipInfo ShippedDate="1998-02-13T00:00:00">
<ShipVia>2</ShipVia>
<Freight>90.97</Freight>
<ShipName>Let's Stop N Shop</ShipName>
<ShipAddress>87 Polk St. Suite 5</ShipAddress>
<ShipCity>San Francisco</ShipCity>
<ShipRegion>CA</ShipRegion>
<ShipPostalCode>94117</ShipPostalCode>
<ShipCountry>USA</ShipCountry>
</ShipInfo>
</Order>
</Orders>
</Root>