An example demonstrating how to remove all attributes of a Ballerina XML value recursively.

xml_remove_all_attributes.bal

import ballerina/io;

public function main() {
    xmlns "http://abc.def";

    xml x = xml `<hello foo="bar">
                    <ns1:world xmlns:ns1="http://qwe.asd" xyz="pqr">hello world</ns1:world>
                 </hello>`;

    io:println(x);
    // <hello xmlns="http://abc.def" foo="bar">
    //                 <ns1:world xmlns:ns1="http://qwe.asd" xyz="pqr">hello world</ns1:world>
    //              </hello>

    io:println("\nRemoving Attributes...");
    removeAttributes(x);
    io:println(x);
    // Removing Attributes...
    // <hello xmlns="http://abc.def">
    //                 <ns1:world xmlns:ns1="http://qwe.asd">hello world</ns1:world>
    //              </hello>
}

function removeAttributes(xml x) {
    if !x.isElement() {
        return; 
    }

    x.setAttributes({});

    foreach xml|string y in x.getChildren() {
        if (y is xml) {
            removeAttributes(y);
        }
    }
}