I've found the documentation for adding and removing XML schemas to/from XML schema repository in DB2 for IBM i (https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_72/rzasp/rzaspxml2720.htm).
I haven't found any hints as to how to query XML schema repository to check what is already registered.
I've found an article on DeveloperWorks (http://www.ibm.com/developerworks/library/x-validenv1/) that points to the SYSCAT.XSROBJECTS table, but this refers to DB2 for LUW and such an object doesn't exist in DB2 on IBM i 7.1 (executing "select * from SYSCAT.XSROBJECTS" results in "XSROBJECTS in SYSCAT type *FILE not found").
I am sure there is a similar system table on IBM i, just can't find any reference to the proper name of that table at the moment.
Anyone can help with a way to query XML schema repository for the list of registered schemas (preferably using SQL)?