Read weblogic.xml values overwritten by deployment plan?

Question

I have a web application with <security-role-assignment> nodes in weblogic.xml Eg:

<security-role-assignment>
    <role-name>Application Role 1</role-name>
    <principal-name>Active Directory Group Principal</principal-name>
</security-role-assignment>

During the deployment in WebLogic the principal-name are overwritten with a deployment plan to set the correct group principal name (this works).

I now have to access that role-name <-> principal-name mapping programatically from within the web application.

Reading the weblogic.xml this way does not work, that results in the original (unmodified by the deployment plan) XML and values:

request.getServletContext().getResourceAsStream("/WEB-INF/weblogic.xml")

Question

How can I access entries in weblogic.xml which are overwritten by a deployment plan?