Update/INSERT data based on an XML?

I have had some help in a previous question regarding how to update a table from an XML document.  The code is below.

It updates the ddt_value column given the documentid and ddt_name of the row.

However i have discovered that i also need to insert new rows if the updated row does not exist.

So if there is not a row for the documentId and ddt_Fieldname combination in the table i need to insert a new row with the documentid, ddt_Fieldname and the ddt_value.

Does this require me to traverse the xml document or can the existing sql be extended?

      with Data
      as ( select
	         TestForm1.value('Id[1]', 'INT') AS ID ,
             KeyValue.value('local-name(.)', 'NVARCHAR(255)') AS [Key] ,
             KeyValue.value('.', 'NVARCHAR(255)') AS [Value]
           from  @XmlData.nodes('/BRUM-registret/FormidableTest') A ( TestForm1 )
           cross apply TestForm1.nodes('*[local-name()!="Id"]') B ( KeyValue )
             )
      update  DD
        set ddt_FieldValue = D.[Value]
        from DocumentData DD 
		  inner join Data D on DD.DocumentId = D.ID and DD.ddt_FieldName = D.[Key];

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The xml looks like this:

<BRUM-registret><FormidableTest><Id>11</Id><RegisteringUnitId>1</RegisteringUnitId><PersonId>1311</PersonId><PersonIdentity>199107153562</PersonIdentity><UpdateUserId>1</UpdateUserId><CreateDateTime>2014-10-01 11:02:07</CreateDateTime><UpdateDateTime>10/01/2014 11:05:46</UpdateDateTime><Approved>false</Approved><ApprovedDateTime/><ApprovedUserId/><Namn>5567</Namn><Alder>awd</Alder></FormidableTest></BRUM-registret>

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soozhAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
please check the MERGE statement to update or insert as needed:
http://msdn.microsoft.com/en-us/library/bb510625.aspx
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