File XSD di esempio: Customers e Orders
Il file XSD seguente viene utilizzato in vari esempi nella documentazione relativa a LINQ to XML. Tale file contiene una definizione dello schema per il File XML di esempio: Customers e Orders (LINQ to XML). Lo schema utilizza le funzionalità xs:key e xs:keyref di XSD per stabilire che l'attributo CustomerID dell'elemento Customer è una chiave e per stabilire una relazione tra l'elemento CustomerID in ogni elemento Order e l'attributo CustomerID in ogni elemento Customer.
Per un esempio relativo alla scrittura di query LINQ in cui tale relazione viene sfruttata utilizzando la clausola Join, vedere Procedura: unire due raccolte tramite join (C#) (LINQ to XML).
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>