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my $header = [{
    parts => [{
...
        mustUnderstand => 1
    }]
}];

error: cannot find element or attribute `{http://example.com/tns}token
+'

Answer: $VAR1 = {
          'parameters' => {
...
                        },
          '{http://example.com/tns}token' => bless( do{\(my $o = 44800
+400)}, 'XML::LibXML::Element' )
        };

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified"
...
  xmlns:tns="http://example.com/tns">
  <xs:element name="token" nillable="true" type="xs:string" />
</xs:schema>