XPath filter not working with namespaces

[mikasabaggins]

Hi everyone,
I’m using Oxygen XML Editor to process an XML file that includes multiple namespaces. I wrote an XPath expression to select specific elements, but it returns no results even though the elements clearly exist in the document.

I suspect it’s related to how namespaces are handled in XPath, but I’m not sure how to properly declare or reference them inside Oxygen. Could someone explain the correct way to use namespace prefixes in XPath within Oxygen, or point out what I might be missing?