xml

Normally, I use code like this to fine-tune my XMLBeans namespaces for textual output:

XmlOptions xmlOptions = new XmlOptions();
xmlOptions.setSavePrettyPrint();
HashMap suggestedPrefixes = new HashMap();
xmlOptions.setSaveAggresiveNamespaces();
suggestedPrefixes.put(" http://www.w3.org/2001/XMLSchema-instance", "xsi");
xmlOptions.setSaveSuggestedPrefixes(suggestedPrefixes);
String xmlStr = doc.xmlText(xmlOptions);

The first difficulty I have is with explicit prefixes like "xmlns" in these combinations: "xmlns:tns" or "xmlns:soap". They don't seem to be accepted as specification by XMLBeans and lead to a guessed namespace abbreviation in output of XMLBeans. Omitting the "xmlns:" part works for the suggestedPrefixes HashMap - but I require them also to be explicitly mentioned with "xmlns:" prefix at least in the namespace definition section created by XMLBeans because they will later be subject to XML signing where every bit counts. I cannot achieve this so far.

My main question is: How can I specify/control how AXIS2 calls XMLBeans/SOAP for outputting the XML?

Keith Chapman commented in the WSO2 online forum:
"Axis2 allows you to pass in options to these various dataBinding frameworks by prefixing the option with -E. But going through the XMLBeans integration code in axis2 I don't see us taking note of the options you mention above. Perhaps you could raise this as a JIRA on the axis2 list."

I found the XMLBeans integration code in this directory:
src/modules/xmlbeans/src/org/apache/axis2/xmlbeans
However, the class/constructor Axis2BindingConfig in file CodeGenerationUtility just seems to configure the mapping of URIs to package names. What I need to tune are the settings when writing the data wihtin an XMLBean to a file or stream, e.g. using XmlOptions as stated above. How/where can this be added/configured/patched in AXIS2? With some hints, I might be able to do the extension/patch in AXIS2 myself.

I need to create an XML that conforms exactly to a given specification in each and every bit because it is subject to an XML signature. Since the mentioning of namespaces is not adjusted perfectly by XML canonicalization, this is a serious issue.
Since the XML structures are stored in their own class structures (and not just as simple text strings) in the SOAP libraries, I can't easily adapt/correct them.
Is there any point where I can easily add some project-specific patches to the SOAP or AXIS2 libraries to really adjust every bit of XML before signing?
The best spot for patches I can think about right now is the XML canonicalization (org.apache.xml.security.c14n) which also requires some complex attribute handling. Does anybody have some other suggestions?
Are there any interfaces or interceptors foreseen for XML fine-tuning? Are there any easily adaptable examples for using them in this scenario?
Does anybody have experience fine-tuning the XML for using XML signatures that have to be exactly compatible with a 2 years old server using some other implementation for canonicalization and XML binding?