Generate Database Schema information as XML - sql-server

Question

I am trying to generate XML based on an SQL Server Schema. I have followed a few references including: (How to convert database table structure to XML file in sql server?)
After some trial and error, I have gotten as far as:
SELECT TABLE_NAME as '#tablename',
(
SELECT
DATA_TYPE as 'Column/#datatype',
case data_type
when 'nvarchar'
then CHARACTER_MAXIMUM_LENGTH
when 'varchar'
then CHARACTER_MAXIMUM_LENGTH
else null
end as 'Column/#Length',
case IS_NULLABLE
when 'NO' --caseinsensitive by default
then 'False'
when 'YES'
then 'True'
else null
end
AS 'Column/#is_nullable',
Column_Name as 'Column'
FROM INFORMATION_SCHEMA.COLUMNS
where INFORMATION_SCHEMA.COLUMNS.TABLE_NAME =
INFORMATION_SCHEMA.TABLES.TABLE_NAME
order by INFORMATION_SCHEMA.COLUMNS.ORDINAL_POSITION
-- For XML Path('Column'), type
For XML Path, type
)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='dbo'
ORDER BY TABLE_NAME ASC
For XML PATH ('Table'),Root('Tables')
What I get is:
<Tables>
<Table tablename="Table1">
<row>
<Column datatype="int" is_nullable="False">AA</Column>
</row>
<row>
<Column datatype="nvarchar" Length="50" is_nullable="True">Name</Column>
</row>
<row>
<Column datatype="bit" is_nullable="False">Active</Column>
</row>
<row>
<Column datatype="timestamp" is_nullable="False">CreatedDate</Column>
</row>
</Table>
<Table tablename="Table2">
<row>
<Column datatype="int" is_nullable="False">AA</Column>
</row>
<row>
<Column datatype="datetime2" is_nullable="True">CreatedDate</Column>
</row>
</Table>
</Tables>
The expected output would have the following structure.
<Tables>
<Table tablename="Table1">
<Columns>
<Column datatype="int" is_nullable="False">AA</Column>
<Column datatype="nvarchar" Length="50" is_nullable="True">Name</Column>
<Column datatype="bit" is_nullable="False">Active</Column>
<Column datatype="timestamp" is_nullable="False">CreatedDate</Column>
</Columns>
</Table>
<Table tablename="Table2">
<Columns>
<Column datatype="int" is_nullable="False">AA</Column>
<Column datatype="datetime" is_nullable="True">CreatedDate</Column>
<Columns>
</Table>
</Tables>
Can someone shed some light on
How to remove the individual <row></row> tags and replace with a single set of outer <columns></columns>
how to change datatype= datetime2 to datatype= datetime
Thank you for your help.

Answer 1

Your were close. Just take note of (...) as columns and the Path('') in the subquery
Updated... I missed the datetime requirement
Select TABLE_NAME as '#tablename'
,(
Select case when DATA_TYPE like 'datetime%' then 'datetime' else DATA_TYPE end as 'Column/#datatype',
case data_type
when 'nvarchar'
then CHARACTER_MAXIMUM_LENGTH
when 'varchar'
then CHARACTER_MAXIMUM_LENGTH
else null
end as 'Column/#Length',
case IS_NULLABLE
when 'NO' --caseinsensitive by default
then 'False'
when 'YES'
then 'True'
else null
end AS 'Column/#is_nullable',
Column_Name as 'Column'
FROM INFORMATION_SCHEMA.COLUMNS
where INFORMATION_SCHEMA.COLUMNS.TABLE_NAME = INFORMATION_SCHEMA.TABLES.TABLE_NAME
order by INFORMATION_SCHEMA.COLUMNS.ORDINAL_POSITION
For XML Path(''), type
) AS Columns
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='dbo'
ORDER BY TABLE_NAME ASC
For XML Path('Table'),Root('Tables')
Sample Results
<Tables>
<Table tablename="OD">
<Columns>
<Column datatype="int" is_nullable="False">OD-Nr</Column>
<Column datatype="int" is_nullable="True">OD-Pt</Column>
<Column datatype="int" is_nullable="True">OD-PS</Column>
<Column datatype="varchar" Length="50" is_nullable="False">OD-Class</Column>
<Column datatype="varchar" Length="250" is_nullable="False">OD-Title</Column>
<Column datatype="int" is_nullable="False">OD-LM-Usr</Column>
<Column datatype="datetime" is_nullable="False">OD-LM-UTC</Column>
<Column datatype="int" is_nullable="False">OD-Deleted</Column>
</Columns>
</Table>
<Table tablename="OD-Map">
<Columns>
<Column datatype="int" is_nullable="False">Map-Nr</Column>
<Column datatype="varchar" Length="50" is_nullable="True">Map-Grp</Column>
<Column datatype="varchar" Length="500" is_nullable="True">Map-Val1</Column>
<Column datatype="varchar" Length="500" is_nullable="True">Map-Val2</Column>
<Column datatype="varchar" Length="500" is_nullable="True">Map-Val3</Column>
<Column datatype="varchar" Length="500" is_nullable="True">Map-Val4</Column>
<Column datatype="int" is_nullable="True">Map-LM-Usr</Column>
<Column datatype="datetime" is_nullable="True">Map-LM-UTC</Column>
<Column datatype="bit" is_nullable="True">Map-Deleted</Column>
</Columns>
</Table>
</Tables>