Annotated XDR Schemas (Deprecated in SQLXML 4.0)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Annotated XDR schemas are deprecated. No future development work will be done on this feature. Avoid using this feature in new development work. Instead, use annotated XSD schemas. You can convert existing annotated XDR schemas to XSD schemas. For more information, see Converting Annotated XDR Schemas to Equivalent XSD Schemas (SQLXML 4.0). For information about the deprecated XDR schemas, see the SQL Server 2008 documentation.
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