sql replace function for xml type column

[msjonathan]

I have a column "XML" as type xml in my database. And I want to replace some xml parameters.
and I did this:

update core.Desktops
set [xml] = replace(CAST([XML] as nvarchar(max)),
'<property name="Name">colDepartments</property>
',
'<property name="ColumnEditName">repDepartments</property>
')

and it does not work, when I change the type of my column to text, or nvarchar it works. So I think it's all about the casting/ type of column.

Do you have any tips to avoid this, a workaround, ....?

I added the xml example in attachment.

[msjonathan]

I found my problem , nvarchar(max) is only 8000 characters long. And the xml column exists out of 32000 characters. has anyone a solution for this problem, I can't cast xml to text.

Edit: I was wrong varchar has a max of 8000, nvarchar has enough of characters