Import xml namespace from custom Dataweave module - mule

Question

I'm trying to create a custom Dataweave module for centralizing my custom XML namespaces.
I followed the official document of Mulesoft:https://docs.mulesoft.com/mule-runtime/4.3/dataweave-create-module
it states that: "When you import a custom module into another DataWeave script, any functions, variables, types, and namespaces defined in the module become available for use in the DataWeave body".
So I was expecting that I could create a module (in modules folder) containing my namespaces like this: Namespaces.dwl
ns myNs1 http://namespaces/my1
ns myNs2 http://namespaces/my2
import that module in another Dataweave like this:
%dw 2.0
import * from modules::Namespaces
output application/java
---
{
body: {
myNs1#Response: {
outcome: 'ACCEPTED'
}
} write "application/xml"
}
But I got this error:
The prefix myNs1 has not been previously declared using ns
I'm running on Mule 4.3.0

Answer 1

As aled have pointed out, it might have been a bug or incorrect information in the docs. From what I can see, the namespaces are properly imported but it seems that prefixes are expected to be declared locally.
You can use below:
%dw 2.0
import * from modules::Namespaces
output application/java
var myNs1Local = myNs1 as Namespace
---
{
body: {
myNs1Local#Response: {
outcome: 'ACCEPTED'
}
} write "application/xml"
}
which will result to the expected output.
{
body: "<?xml version='1.0' encoding='UTF-8'?>\n<myNs1:Response xmlns:myNs1=\"http://namespaces/my1\">\n <outcome>ACCEPTED</outcome>\n</myNs1:Response>" as String {class: "java.lang.String"}
} as Object {encoding: "UTF-8", mediaType: "*/*", mimeType: "*/*", class: "java.util.LinkedHashMap"}
Notice here that what I used as the prefix is the declared variable (myNs1Local) but it still write the prefix as referenced in Namespace.dwl