In SQL Server 2000, if you wanted to store XML data within the database, you had to store it in a character or binary format. This wasn’t too troublesome if you just used SQL Server for XML document storage, but attempts to query or modify the stored document within SQL Server were not so straightforward. Introduced in SQL Server 2005, the SQL Server native xml data type helps address this issue.
Relational database designers may be concerned about this data type, and rightly so. The normalized database provides performance and data integrity benefits that put into question why we would need to store XML documents ...