How to programmatically obtain where a Namespace is interoperability enabled or not?

Hi guys,

A client want to programmatically list all namespaces and whether they are interoperability or not. Do we have apis or sql to do that? Thanks.

I've tried several methods of %SYS.Namespace but did not find it yet. Also when I use sql to select from %SYS.Namespace through jdbc, it always return an empty result set.