File XSD di esempio: Clienti e ordini (LINQ to XML)

Il file XSD seguente viene usato in vari esempi nella documentazione di LINQ to XML. Questo file contiene una definizione dello schema per File XML di esempio: Clienti e ordini. Lo schema usa 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 usando la clausola Join, vedere Come unire due raccolte.

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>