How to transform common object to xml string

I know that I can import xml dtd a the common data type in iStudio. However, does anyone know how to serialize it back to the xml string during the field mapping? Is it even possible?
Thanks,
Edward

Thanks Stuart for your reply. What I'm trying to do is to convert the xml message from the common view object to JMS Text Message. I declared the application data type as AQ$JMS_TEXT_MESSAGE and I try to map the common data type which is I imported from dtd to the application JMS type. During the mapping I need to serialize the common data type object back to xml string, so I can copy it to text_vc field defined in JMS Text Message (String type).
Or do you know any other alternative to convert from RAW XML payload type to JMS payload type in iStudio?
Thanks,
Edward

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See if these posts help: http://blogs.msdn.com/b/mattm/archive/2007/12/15/xml-source-making-things-easier-with-xslt.aspx
http://simonlv.blogspot.ca/2012/08/ssis-step-by-step-6-use-xslt-to.html
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