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Comments in XQuery

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Applies to: SQL Server

You can add comments to XQuery. The comment strings are added by using the "(:" and ":)" delimiters. For example:

declare @x xml  
set @x=''  
SELECT @x.query('  
(: simple query to construct an element :)  
<ProductModel ProductModelID="10" />  
')

Following is another example in which a query is specified against an Instruction column of the xml type:

SELECT Instructions.query('  
(: declare prefix and namespace binding in the prolog. :)  
     declare namespace AWMI="https://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions";  
  (: Following expression retrieves the <Location> element children of the <root> element. :)  
  /AWMI:root/AWMI:Location  
') as Result  
FROM Production.ProductModel  
where ProductModelID=7