Exemplo: Especificando as diretivas ID e IDREF
Este exemplo é quase igual ao exemplo Especificando a diretiva ELEMENTXSINIL. A única diferença é que a consulta especifica as diretivas ID e IDREF. Essas diretivas substituem os tipos do atributo SalesPersonID nos elementos <OrderHeader> e <OrderDetail>. Isso forma vínculos intradocumento. Você precisa do esquema para ver os tipos substituídos. Portanto a consulta especifica a opção XMLDATA na cláusula FOR XML para recuperar o esquema.
SELECT 1 as Tag,
0 as Parent,
SalesOrderID as [OrderHeader!1!SalesOrderID!id],
OrderDate as [OrderHeader!1!OrderDate],
CustomerID as [OrderHeader!1!CustomerID],
NULL as [SalesPerson!2!SalesPersonID],
NULL as [OrderDetail!3!SalesOrderID!idref],
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!id], [SalesPerson!2!SalesPersonID],
[OrderDetail!3!SalesOrderID!idref],[OrderDetail!3!LineTotal]
FOR XML EXPLICIT, XMLDATA
Este é o resultado parcial. No esquema, observe que as diretivas ID e IDREF sobrescreveram os tipos de dados do atributo SalesOrderID nos elementos <OrderHeader> e <OrderDetail>. Se você remover essas diretivas, o esquema retornará tipos originais desses atributos.
<Schema name="Schema1" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes">
<ElementType name="OrderHeader" content="mixed" model="open">
<AttributeType name="SalesOrderID" dt:type="id" />
<AttributeType name="OrderDate" dt:type="dateTime" />
<AttributeType name="CustomerID" dt:type="i4" />
<attribute type="SalesOrderID" />
<attribute type="OrderDate" />
<attribute type="CustomerID" />
</ElementType>
<ElementType name="SalesPerson" content="mixed" model="open">
<AttributeType name="SalesPersonID" dt:type="i4" />
<attribute type="SalesPersonID" />
</ElementType>
<ElementType name="OrderDetail" content="mixed" model="open">
<AttributeType name="SalesOrderID" dt:type="idref" />
<AttributeType name="LineTotal" dt:type="number" />
<AttributeType name="ProductID" dt:type="i4" />
<AttributeType name="OrderQty" dt:type="i2" />
<attribute type="SalesOrderID" />
<attribute type="LineTotal" />
<attribute type="ProductID" />
<attribute type="OrderQty" />
</ElementType>
</Schema>
<OrderHeader xmlns="x-schema:#Schema1" SalesOrderID="43659" OrderDate="2001-07-01T00:00:00" CustomerID="676">
<SalesPerson SalesPersonID="279" />
<OrderDetail SalesOrderID="43659" LineTotal="10.373000" ProductID="712" OrderQty="2" />
...
</OrderHeader>
...