my $header = [{
	parts => [{
		name => 'token',
		element => 'tns:token',
		destination => $sessionToken,
		mustUnderstand => 1
	}]
}];

##</code><code>##

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

##</code><code>##

Answer: $VAR1 = {
          'parameters' => {
                          'Output' => {
                                      'SessionToken' => 'sessiontokenvalue'
                                    }
                        },
          '{http://example.com/tns}token' => bless( do{\(my $o = 44800400)}, 'XML::LibXML::Element' )
        };

##</code><code>##

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified"
  targetNamespace="http://example.com/tns"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:tns="http://example.com/tns">
  <xs:element name="token" nillable="true" type="xs:string" />
</xs:schema>