Removing DTD instruction from inbound xml document

I have an xml document incoming to BizTalk which is a DTD compliant. It has an instruction in the top of the document like

<!DOCTYPE SYSTEM .....

I prepared the schema for corresponding DTD.

Now, how can I remove this statement from incoming xml document and change it to a schema instruction before passing to orchestration?

Please help

Sidhu,

Take a look at the Microsoft.BizTalk.Streaming namespace (http://technet.microsoft.com/en-us/library/microsoft.biztalk.streaming.aspx), specifically the XmlTranslatorStream (http://technet.microsoft.com/en-us/library/microsoft.biztalk.streaming.xmltranslatorstream.aspx).

If you extend this class in a decode pipeline component (for example), you can override the TranslateDocType method and strip the DOCTYPE declaration from the incoming message; its a bit fiddly, but it is possible.

If you want a more low-tech approach, load the Xml Message into a string and remove the DOCTYPE using a find/replace pattern, or stick it through some XSLT that maps back to itself but without the DOCTYPE. Both of these approaches are easily doable, but you will incur a large performance hit with large messages.

Rgds, Nick.