Where can I find documentation and example usage of pub.report:runStringTemplate ?

I saw legacy code in my works that contains pub.report:runStringTemplate service calling. The $template input variable has a value that looks like: %ifvar Abc equals(‘TRUE’)%DEF%else%ZZZ%endif%

It seems the runStringTemplate has its own language for the $template input.

I found the explanation of runStringTemplate in Integration_Server_Built-In_Services_Reference.pdf is very scarce. There is no mention of ifvar.
So where can I find the comprehensive documentation and example usage of pub.report:runStringTemplate ?

Info can be found here: http://techcommunity.softwareag.com/ecosystem/documentation/webmethods/wmsuites/wmsuite7/Developer/Guides/7-1-1_DSP_and_Output_Template_Developers_Guide.pdf

Hi jrod, thanks a lot.