It is undocumented. At least I couldn’t find references. In the XMLDB Protocol Server there is an extra service called orarep, and of course, everything which is undocumented interests me to pieces.
The xdbconfig.xml XMLDB Protocol Server configuration file has the following content ( “<>” has been replaced by “[ ]”):
[servlet-mapping]
[servlet-pattern]/orarep/* [/servlet-pattern]
[servlet-name] ReportFmwkServlet [/servlet-name]
[/servlet-mapping]
If you try something like http://localhost:8080/orarep/ something like the following will show up.