How to use 'pub.universalName:find' built in service.

Hello There,

I cam across this service - 'pub.universalName:find '. Does anybody know the use of this built-in service, if so, in what pattern we mention the inputs(namespaceName and localName). Went throug the buil-in service document and i didnt understand it’s use and how to give the inputs.

Thanks,
Veera