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2.1.2.118 [ISO/IEC9075-14:2011] X261, XML type: NAMESPACE without ELEMENT clause

V0153:

The specification states the following:

 Subclause 6.1, "<data type>":
  
 Without Feature X261, "XML type: NAMESPACE without ELEMENT clause", conforming SQL language shall not contain an <XML type> that contains an <XML valid element clause> that does not contain an <XML valid element name specification>.

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

Transact-SQL does not support this feature.

This variation pertains to xml data type and XML Namespaces [XMLNS] functionalities in SQL Server.