Creating a Java content tree from scratch and then marshal it to XML data

Hi,
After binding a schema using JAXB binding, I wrote a class to create a Java content tree from scratch and then marshal it to create an XML document. To see if the resulting xml document is correct, I opened it in XMLSpy and tried to validate it against the original schema.... I got the following error:
"Unable to locate a reference to a supported schema kind (DTD, DCD, W3C Schema, XML-Data, Biz Talk) within this document instance"
Then I realized that the generated xml document didnot contain the following for the root element:
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" and xsi:schemaLocation="....."
i.e, the XML Schema Instance namespace and the schema location.
How do I get these attributes incorporated into the XML document generated during the marshal process.
Thanks.

How do I get these attributes incorporated into the XML document generated during the marshal process.
Add xmlns:xsi and xsi:schemaLocation attributes to the root element in the schema.
<xsd:attribute name="xmlns:xsi" fixed="http://www.w3.org/2001/XMLSchema-instance"/>

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