                             <option value="nomnoml">Nomnoml</option>
                                <option value="pikchr">Pikchr</option>
                                <option selected value="plantuml">PlantUML</option>
                                <option value="structurizr">Structurizr</option>
                                <option value="svgbob">Svgbob</option>
                                <option value="symbolator">Symbolator</option>
                                <option value="tikz">Tik