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Editorial Team
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Asked: 2026-05-12T11:12:54+00:00

In SQL Server you can use an XML datatype and map it to relational

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In SQL Server you can use an XML datatype and map it to relational columns using an AXSD schema.

Mapping between XML and relational
storage By using an annotated schema
(AXSD), the XML is decomposed into
columns in one or more tables. This
preserves fidelity of the data at the
relational level. As a result, the
hierarchical structure is preserved
although order among elements is
ignored. The schema cannot be
recursive.

from MSDN

However I cannot find any documentation on how to do this – or even a good page about AXSD.

Anybody got any good AXSD information. it seems very appropriate to what I want to do (temporarily use XML until i can migrate to something like nHibernate, but still allow a column view of certain pertanent data fields.

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1 Answer

  1. Editorial Team

    Looks like this is the way to do it and this is helpful too.

    And a free book too!

    tip: search for ‘annotated xsd schemass’ and not AXSD!

    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:sql="urn:schemas-microsoft-com:mapping-schema">
  <xsd:element name="Employee" sql:relation="Employees" >
   <xsd:complexType>
     <xsd:sequence>
        <xsd:element name="FName"  
                     sql:field="FirstName" 
                     type="xsd:string" /> 
        <xsd:element name="LName"  
                     sql:field="LastName"  
                     type="xsd:string" />
     </xsd:sequence>
        <xsd:attribute name="EmpID" 
                       sql:field="EmployeeID" 
                       type="xsd:integer" />
    </xsd:complexType>
  </xsd:element>
</xsd:schema>
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