How to use datetime2 type in XML SCHEMA?

Question

I'm trying to use SQL Server XML SCHEMA types like datetime2 in collections and tables

CREATE XML SCHEMA COLLECTION [XmlValuesSchemaCollection_datetime2] AS 
'<?xml version="1.0"?>
<xsd:schema 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sql2008/SqlTypes.xsd"
    attributeFormDefault="unqualified" elementFormDefault="qualified">

    <xsd:element name="datetime2" type="xsd:datetime2"/>
</xsd:schema>';
GO

CREATE TABLE XmlValuesTable_datetime2 (
    [uid] [int] IDENTITY PRIMARY KEY,
    v XML(XmlValuesSchemaCollection_datetime2) NOT NULL
);
GO

INSERT INTO XmlValuesTable_datetime2 (v)  
VALUES (N'<datetime2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">2014-06-18 06:39:05.190</datetime2>');
GO

but I have error Reference to an undefined name 'datetime2' within namespace 'http://www.w3.org/2001/XMLSchema'. Same with type="xsd:datetime2" - error

Reference to an undefined name 'datetime2' within namespace 'http://schemas.microsoft.com/sqlserver/2004/sqltypes/sql2008/SqlTypes.xsd'

It suppose to work somehow, types described in https://learn.microsoft.com/en-us/previous-versions/sql/sql-server-2008-r2/bb677236(v=sql.105)?redirectedfrom=MSDN but unfortunately I have no clue what is wrong.

Answer 1

Erland Sommarskog answered at msdn Solution is

CREATE XML SCHEMA COLLECTION [XmlValuesSchemaCollection_datetime2] AS 
'<?xml version="1.0"?>
<xsd:schema    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes"      attributeFormDefault="unqualified" elementFormDefault="qualified">
   <xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sql2008/sqltypes.xsd"/>

   <xsd:element name="datetime2" type="sqltypes:datetime2"/>
</xsd:schema>';