URN (Uniform Resource Name)

[majid-al-saidi]

Greetings, is there a way to add the URN (Uniform Resource Name) to the attributes?
I tried this:
->addAttribute(new Attribute('attribute', $value, 'urn:oid:X.X.X.X'))

The result:
<Attribute Name="attribute"> <AttributeValue>$value</AttributeValue> </Attribute>

There is no urn.

[upwebdesign]

@majid-al-saidi, I believe this is what you are looking for:

->addAttribute(new Attribute('attribute', 'urn:oid:X.X.X.X'));