ey are applied in
                the order given</p>
            <p>The mapping function should return non 0 to allow the element to be
                returned.</p>
            <div class="refsect3">
                <a name="librdf-iterator-add-map.parameters"></a><h4>Parameters</h4>
                <div class="informaltable">
                    <table class="informaltable" width="100%" border="0">
                        <colgroup>
                            <col width="150px" class="parameter