How to insert fragment into xml column generated from query

Question

I'm trying to generate xml from some relational data and then insert a sub node into an xml column. Here's some sample code that obviously doesn't work.  I'm trying to figure out the syntax where the ???? exist.
/* create test tables*/
DECLARE @person TABLE
id int NOT NULL PRIMARY KEY CLUSTERED,
info xml NULL
DECLARE @roles TABLE
id int NOT NULL,
role_name varchar(20) NOT NULL,
PRIMARY KEY
id,
role_name
/* insert test values */
INSERT INTO @person (id, info)
VALUES (1, '<person><name><first_name>Joe</first_name><last_name>Smith</last_name></name></person>'),
(2, '<person><name><first_name>Tim</first_name><last_name>Jones</last_name></name></person>');
INSERT INTO @roles (id, role_name)
VALUES
(1,'Admin'),
(1,'User'),
(2,'Editor'),
(2,'User');
/* make sure that xml comes back correctly*/
SELECT
role_name AS name
FROM @roles AS role
WHERE id = 1 -- works for each id
FOR XML AUTO, ROOT ('roles');
UPDATE p
SET info.modify('insert ???? as last into (/person)[1]')
FROM @person p
INNER JOIN @roles r
ON p.id = r.id
/* desired output in the info column for id = 1*/
<person>
<name>
<first_name>Joe</first_name>
<last_name>Smith</last_name>
</name>
<roles>
<role name="Admin" />
<role name="User" />
</roles>
</person>
Any ideas?

Answer 1

this?
DECLARE @person TABLE
id int NOT NULL PRIMARY KEY CLUSTERED,
info xml NULL
DECLARE @roles TABLE
id int NOT NULL,
role_name varchar(20) NOT NULL,
PRIMARY KEY
id,
role_name
/* insert test values */
INSERT INTO @person (id, info)
VALUES (1, '<person><name><first_name>Joe</first_name><last_name>Smith</last_name></name></person>'),
(2, '<person><name><first_name>Tim</first_name><last_name>Jones</last_name></name></person>');
INSERT INTO @roles (id, role_name)
VALUES
(1,'Admin'),
(1,'User'),
(2,'Editor'),
(2,'User');
/* make sure that xml comes back correctly*/
SELECT
role_name AS name
FROM @roles AS role
WHERE id = 1 -- works for each id
FOR XML AUTO, ROOT ('roles');
UPDATE p
SET info.modify('insert sql:column("x") as last into (/person)[1]')
FROM @person p
CROSS APPLY(SELECT role_name FROM @roles WHERE id = p.id FOR XML PATH(''),ROOT('roles'),TYPE)r(x)
select * from @person
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