How to create xmlns:xsi and xsd information in an XML document

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I have a Delphi XE application that reads a validated XML file, modifies it and then saves it. The saved version can be validated. I use SML Spy to create the file and to validate it.Now I need to create a document in memory and save it. The problem is that I cannot figure out how to generate the xmlns and xsd information attributes to the document so that it can be validated.