Accessing XML stream from ADO against SQL Server 2008

Question

We are migrating ASP code that used ADO to connect to SQL Server 2000. For the most part the code migrated without a hitch to SQL Server 2008 after defining the connection, but one type of query is throwing an error that puzzles me.

Against SQL 2000, we would use code like this:

set oCommand = Server.CreateObject("ADODB.Command")
oCommand.ActiveConnection = oConn 'already established
oCommand.CommandType = adCmdText 

'This is simplified over the real code, but the wrapper is what we use.
oCommand.CommandText = "<Root xmlns:sql='urn:schemas-microsoft-com:xml-sql'><sql:query>" 
+ Server.HTMLEncode(sql) 
+ "</sql:query></Root>" 

oCommand.Dialect = "{5D531CB2-E6ED-11D2-B252-00C04F681B71}" 'SQL Dialect GUID
oCommand.Properties("Output Stream").Value = oXMLDoc 'Already created
oCommand.Execute , , adExecuteStream 'The point of error

The SQL is a stored procedure call that works when called normally. This code continues to work against SQL 2000, but against SQL 2008 it returns:

ERR_OPENSQLXML XMLDB.openSQLXML failed. Error '-2147217898': 'Command dialect is not supported by this provider.'

My first guess is that SQL 2008 relies on MSXML version 6, and I need a new guid. My MSDN and Google-Fu has failed me: all the results I find use this GUID.

Is there a new GUID? Is there a better way? Is that better way less hassle than recoding in ASP.NET (the fate of many pages already).

EDIT: I'm wondering if using the SQLNCLI10 client is preventing this from working?

configConnString = 
"Provider=SQLNCLI10;DataTypeCompatibility=80;Server=XYZZY;Database=ucpm;MARS Connection=True;Trusted_Connection=Yes;"

Answer 1

Rather than focus on the language which i haven't seen documented as changed - ASP.dll is still supported in the next version of windows server from the last check i made.

Can you check the client you are connecting from has the MSSQL Native Client 10 installed rather than the old sql 2000 odbc/oledb clients.