Exemplo: Construindo irmãos com o modo EXPLICIT
Assuma que você quer construir XML que forneça informações de pedidos de vendas. Observe que os elementos <SalesPerson> e <OrderDetail> são irmãos. Cada Pedido tem um elemento <OrderHeader>, um elemento <SalesPerson> e um ou mais elementos <OrderDetail>.
<OrderHeader SalesOrderID=... OrderDate=... CustomerID=... >
<SalesPerson SalesPersonID=... />
<OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=... />
<OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=.../>
...
</OrderHeader>
<OrderHeader ...</OrderHeader>
A consulta em modo EXPLICIT a seguir constrói esse XML. Observe que a consulta especifica valores de Tag de 1 do elemento <OrderHeader>, 2 do elemento <SalesPerson> e 3 do elemento <OrderDetail>. Como <SalesPerson> e <OrderDetail> são irmãos, a consulta especifica o mesmo valor de marca Parent 1 identificando o elemento <OrderHeader>.
USE AdventureWorks2012;
GO
SELECT 1 as Tag,
0 as Parent,
SalesOrderID as [OrderHeader!1!SalesOrderID],
OrderDate as [OrderHeader!1!OrderDate],
CustomerID as [OrderHeader!1!CustomerID],
NULL as [SalesPerson!2!SalesPersonID],
NULL as [OrderDetail!3!SalesOrderID],
NULL as [OrderDetail!3!LineTotal],
NULL as [OrderDetail!3!ProductID],
NULL as [OrderDetail!3!OrderQty]
FROM Sales.SalesOrderHeader
WHERE SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 2 as Tag,
1 as Parent,
SalesOrderID,
NULL,
NULL,
SalesPersonID,
NULL,
NULL,
NULL,
NULL
FROM Sales.SalesOrderHeader
WHERE SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 3 as Tag,
1 as Parent,
SOD.SalesOrderID,
NULL,
NULL,
SalesPersonID,
SOH.SalesOrderID,
LineTotal,
ProductID,
OrderQty
FROM Sales.SalesOrderHeader SOH,Sales.SalesOrderDetail SOD
WHERE SOH.SalesOrderID = SOD.SalesOrderID
AND (SOH.SalesOrderID=43659 or SOH.SalesOrderID=43661)
ORDER BY [OrderHeader!1!SalesOrderID], [SalesPerson!2!SalesPersonID],
[OrderDetail!3!SalesOrderID],[OrderDetail!3!LineTotal]
FOR XML EXPLICIT;
Este é o resultado parcial:
<OrderHeader SalesOrderID="43659" OrderDate="2005-07-01T00:00:00" CustomerID="676">
<SalesPerson SalesPersonID="279" />
<OrderDetail SalesOrderID="43659" LineTotal="10.373000" ProductID="712" OrderQty="2" />
<OrderDetail SalesOrderID="43659" LineTotal="28.840400" ProductID="716" OrderQty="1" />
<OrderDetail SalesOrderID="43659" LineTotal="34.200000" ProductID="709" OrderQty="6" />
...
</OrderHeader>
<OrderHeader SalesOrderID="43661" OrderDate="2005-07-01T00:00:00" CustomerID="442">
<SalesPerson SalesPersonID="282" />
<OrderDetail SalesOrderID="43661" LineTotal="20.746000" ProductID="712" OrderQty="4" />
<OrderDetail SalesOrderID="43661" LineTotal="40.373000" ProductID="711" OrderQty="2" />
...
</OrderHeader>