[JAXB] Multiple imports in the root node

Question

Hello,
I use JAXB and am doing this scenario : unmarshalling an XML document created manually, and automatically marshalling another from the generated Java code.
This is a multiple schemas / multiple imports issue.
I would like the 2 XML documents to be similar, but in the first one, I get :
<?xml version="1.0" encoding="UTF-8"?>
<aaa:first xmlns:aaa="http://aaa" xmlns:bbb="http://bbb">
</aaa>
and in the second :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<aaa:first xmlns:aaa="http://aaa" xmlns:ns1="urn:abc" ...>
<bbb:second xmlns:bbb="http://bbb">
</bbb>
</aaa>
So, how is that possible to import multiple namespaces (xmlns) in a single node please ? It seems that JAXB does the import only when needed, and won't group all the imports in the root node.
(moreover, how can I disable the "standalone" attribute in the header of the generated XML document please ?)
Thanks in advance.

Answer 1

Ok, I found a solution to get all namespaces placed in the root of the generated XML document : one have to implement a NamespacePrefixMapper
marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper",new NamespacePrefixMapperImpl());and redefining its ' public String[] getPreDeclaredNamespaceUris()' method.
For now, the problem is that namespaces declared there are somehow static. In fact, when unmarshalling Java objects from an XML document, it seems that this document namespaces are lost.
Do you know a way these namespaces would be kept somewhere, associated with the unmarshalled object ? I need these namespaces in the case that I would create another XML file from it in the future.
It's seems logical to keep this with the object, so did I miss something please ?