Hi Selva,
"ns" states for the "prefix" of a defined "namespace" and the number is to differenciate each of them.
namespace are related to the format of the data present in the xml document.
I don't think this is configurable. You might open an Idea on the Security page if it would be even
possible to implement it.
https://communities.ca.com/message/241729406
Hope that's help,
Patrick