Alla IDREFS- eller NMTOKENS-kolumner i en FOR XML EXPLICIT-fråga måste placeras i en separat SELECT-programsats och instanserna måste placeras direkt efter det element de tillhör.
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English version
Every IDREFS or NMTOKENS column in a FOR XML EXPLICIT query must appear in a separate SELECT clause, and the instances must be ordered directly after the element to which they belong.
SQL Server