f-total-children-6 sf-parent-children-0 sf-single-children-6 menuparent"><a href="../users-guide/writing-external-functions.html" class="sf-depth-3 menuparent">11. Writing External Functions</a><ul><li id="menu-1305-1" class="first odd sf-item-1 sf-depth-4 sf-no-children"><a href="../users-guide/writing-external-functions/OVERVIEW.html" class="sf-depth-4">11.1 OVERVIEW</a></li><li id="menu-1306-1" class="middle even sf-item-2 sf-depth-4 sf-no-children"><a href="../users-guide/writing-external-functions/GETT