Thanks Robert, I've read this article, but the syntax isn't entirely clear to me:

Select ID,Company from rcc_IC.ItemList
Where FOR SOME %ELEMENT(rcc_IC.ItemList.Items) ($list(%Value,3) in ('blue','yellow'))

Here the integer is used, but I need to search using a named property

Thanks a lot! 

In short, I failed.

1. This requires installing pip3 on Unix and you'll need to be su

2. If you want to reference npm libraries, you'll need to be su (although technically it's possible to place JS library/libraries code in the XData section(s))

3. The most annoying thing is that most JS libraries are asynchronous and that's a dead end

Thanks, got it. Then perhaps this setting can somehow be changed programmatically, in the installer code?

Thanks a lot Robert. I completely forgot about multiple inheritance 😶

Thanks so much! It was not obvious for me that the DebugMode property value is of type integer (looks like boolean)

Interesting... I'm actively using the Write method, but for emitting console messages using constant strings. Anyway, thanks

It seems to me that I found the answer (was googling for two hours and found nothing, then used forum search and voila):

1. Declare a class which inherits Ens.Production:

Class My.Production Extends Ens.Production
{

XData ProductionDefinition
{
<Production Name="My.Production" TestingEnabled="true" LogGeneralTraceEvents="true">
  <Description></Description>
  <ActorPoolSize>1</ActorPoolSize>
</Production>
}
}

2. And launch:

Set isProductionRunning = ##class(Ens.Director).IsProductionRunning("My.Production")
If isProductionRunning = 0 {
            Set sc = ##class(Ens.Director).StartProduction("My.Production")
}

Ended up with a compromise 😊 Just replaced <transform> with a <call> and delegated that transform to BO 

> What parameter are you trying to change?

My subclassed Transform calls some external web service and I want to  allow a user configure that web service settings (url-port-ssl-etc) by clicking on the business process <transform> element. Also, it is crucial that such a transformation cannot be delegated to BO. So anyway, thank you, it is fine if I move settings to BP, but it is not that elegant :(

Perfect, thanks a lot

Got it! Now I'm struggling with adding a value to that array. Would it be correct?

set arr(arr + 1) = value

Thanks Robert. 

> args = number of params

Arrays in IRIS are counterintuitive 😥

Here it is:

Class MyHL7HTTPService Extends EnsLib.HL7.Service.HTTPService
{

Method OnAdapterHTTPResponse(
    ByRef pStatus As %Status,
    ByRef pHTTPResponseStatus As %String,
    ByRef pBodyLen As %Integer,
    ByRef pResponseBodyStream As %Stream.Object,
    ByRef pMainResponseHeader As %String,
    ByRef pHeaderExtra As %String)
{
    set pHeaderExtra = pHeaderExtra _ "Access-Control-Allow-Origin: *"_ $char(13) _ $char(10) 
                                    _ "Access-Control-Allow-Headers: *" _ $char(13) _ $char(10) 
                                    _ "Access-Control-Allow-Methods: *" _ $char(13) _ $char(10)
}

}

I need to find a reason of a performance bug in the source code of the original class :) 

Great answer! And yes, I badly need that for testing!

Thanks, I caught your idea but no, IIS is not a cause, although the issue exists in Windows but not in Linux