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2.1.2.104 [ISO/IEC9075-14:2011] X221, XML passing mechanism BY VALUE

V0139:

The specification states the following:

 Subclause 11.5, "<XML passing mechanism>":
  
 Without Feature X221, "XML passing mechanism BY VALUE", conforming SQL language shall not contain an <XML passing mechanism> that is BY VALUE.

Microsoft SQL Server 2008 R2 and Microsoft SQL Server 2012 vary as follows:

Transact-SQL does not support this feature. The xml data type cannot be used as a parameter to any scalar, built-in functions other than ISNULL, COALESCE, and DATALENGTH.

This variation pertains to xml data type functionality in SQL Server.