Jaxb xsd:any problem

Question

I am not sure how to set the namespace (please see schema snippet below). Do I do this with setAny(java.lang.Object)? What kind of object do I pass to setAny() because it is trying to class cast it to JAXBObject. How do I create an instance of JAXBObject?
I have in my xsd:
<xsd:element name="order">
          <xsd:complexType>
               <xsd:sequence>
                    <xsd:any namespace="urn:abc.com" minOccurs="0" maxOccurs="1"/>
                    <xsd:element ref="a"/>
                    <xsd:element ref="b"/>
               </xsd:sequence>
               <xsd:attribute name="locale" type="xsd:string" use="optional"/>
               <xsd:attribute name="sourceid" type="xsd:string" use="optional"/>
          </xsd:complexType>
     </xsd:element>

Answer 1

Refer to section
E.2 Not Required XML Schema
concepts
"A JAXB implementation is not required to support the following XML Schema
concepts for this version of the specification. A JAXB implementation may
choose to support these features in an implementation dependent manner."
E.2.2 Not supported while manipulating the XML
content
Schema component: wildcard
(any)
how can i know if an xml element with xsi:nil="true" (unmarshal)
and set xsi:nil="true" for an element (marshal) ?
According to the JAXB 1.0 specification:
If {nillable} is "true", the methods setNil() and isNil() are
generated.