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2.1.2.91 [ISO/IEC9075-14:2011] X181, XML(DOCUMENT(UNTYPED)) type

V0126:

The specification states the following:

 Subclause 6.1, "<data type>":
  
 Without Feature X181, "XML(DOCUMENT(UNTYPED)) type", conforming SQL language shall not contain an <XML type> whose <primary XML type modifier> is DOCUMENT and <secondary XML type modifier> is UNTYPED.

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

Transact-SQL partially supports this feature. Transact-SQL supports the primary xml type modifier of DOCUMENT, but does not support the secondary xml type modifier of UNTYPED.

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