T-SQL (SS2K8) :: XML Path - Get File Records Along With If Any Error Messages Occurred

Below is the test data and my query. Basically i am trying to get the File records along with if any error messages occurred. I am getting the output as expected but the message column has "," at the front and sometime at the end of the column. How do i avoid that.

declare @Files table (ID int identity(1,1) primary key,Filename varchar(50),Date_Created datetime)
insert into @Files (Filename,Date_Created)
select 'File1',GETDATE()-1 union all
select 'File2',GETDATE()-1 union all
select 'File3',GETDATE()-1 union all

[Code] .....