[From string (line 26) ]                                                                             
                                                                                                     
@startuml                                                                                            
!unquoted procedure $app($id)                                                                        
!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Container.puml
!$data={"participants" :[                                                                            
{"id": "cm" ,"label": "customer master","desc": "manages customers"},                                
{"id": "tm" ,"label": "transaction manager","desc": "manages transactions"},                         
{"id": "am" ,"label": "account master","desc": "manages accounts"}                                   
]                                                                                                    
}                                                                                                    
!$id_exist = %false()                                                                                
!foreach $part in $data.participants                                                                 
  !if $part.id == $id                                                                                
    !$id_exist = %true()                                                                             
    !if $INCLUDE_DESC                                                                                
       System($part.id, $part.label, $part.desc)                                                     
    !else                                                                                            
       System($part.id, $part.label)                                                                 
    !endif                                                                                           
  !endif                                                                                             
!endfor                                                                                              
!if %not($id_exist)                                                                                  
System($id, "enter label for <u:red>$id")                                                            
!endif                                                                                               
!endprocedure                                                                                        
                                                                                                     
!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Container.puml
^^^^^                                                                                                
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