modify xml with variables

I want to make a function that modifys a xml string. the problem is using variables in the modify expression. @key has the where clause of the modify. I get the error: The argument 1 of the xml data type method "modify" must be a string literal.
ALTER FUNCTION dbo.XmlUpdate (
	@str nvarchar(max),
	@key nvarchar(50),
	@value nvarchar(100)
)
	RETURNS nvarchar(max)
AS
 
BEGIN
 
	DECLARE	@xml XML
 
	SET @xml = convert(XML, @str)
 
	SET @xml.modify('replace value of (' + @key + ')[1] with sql:variable("@value")')
	
	SET @str = Convert(nvarchar(max), @xml)
	RETURN @str
 
END 
 
 
Function CALL:
dbo.XmlUpdate(SettingValue, '/FilterParametersList/Filters/Filter/Parameters/Parameter[@id="asdf"]/Name/text()', '1234')

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1eEuropeAsked:
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momi_sabagCommented:
i think you can't use a variable, you will need to use sp_executesql with the modify statement and link the variables
you can see an example of how to use sp_executesql with variables in sql server books online
0
1eEuropeAuthor Commented:
you cant use sp_executesql in a function
0

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Microsoft SQL Server 2005

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