Value Passed for Paging Info displays different code =#"SYSTEM_SYSRULES_pagingInfo"(1,-1)

Question

While checking the parameters passed with a User Input task node, i found the code as =#"SYSTEM_SYSRULES_pagingInfo"(1,-1) for an any type rule input. 
 Has anyone come across this?

Thanks in advance!

Hema · Accepted Answer

It is surprising to know that this works. 
Also, executing the below code works. 
 #"SYSTEM_SYSRULES_formLayout"( 
 label:"Hello" 
 ) 
 
While the application is exported, all the code we have written for expression rules, interfaces etc., are saved as xml files. In those files, the code is saved in the above format (#"SYSTEM_SYSRULES_formLayout"()). As hidden functions like sort() and eval() executes even though we don't find any documentation, this code might be working.

Thanks, 
Hema

Sidhant Behura · Answer

Surprisingly it works!
I saw this for the first time. I executed in an expression rule and got the below result.
Raw: [startIndex=1, batchSize=-1, sort=]
Expression: 'type!{www.appian.com/.../2009}PagingInfo'('startIndex': 1, 'batchSize': -1)

Looks like its a valid way of passing pagingInfo but couldnt find any documentation or posts related to this.

Regards,
Sidhant Behura