some code styles problems in XReports Module

hey

I am playing around a little bit on XReports Module and I am unfamiliar with its code style. I want to know what is the “value=”${ui.message(“general.save”);" I have attached animage of that please take a look at that image part will do and could anyone please give me some link to get to know and to get familiar with XReports Module code style?

@dkayiwa ??

Is this helpful? https://wiki.openmrs.org/display/docs/UI+Framework+Reference+Guide#UIFrameworkReferenceGuide-Messages