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Since we can query on the XML file from C# (.NET), why do we need an XSD file? I know it is metadata file of particular XML file. We can specify the relationships in XSD, but what is its functioning then? 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> </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">

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