於 FOR XML EXPLICIT 查詢中的每一個 IDREFS 或 NMTOKENS 資料行必須出現在不同的 SELECT 子句中，而且執行個體必須直接在其所屬元素之後排序。
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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