@Override public void appendDef(Wom3DefinitionListDef def) { Backbone parent = getParentNode(); if (parent != null) { Wom3Node before = null; if (!defs.isEmpty()) { Wom3DefinitionListDef lastDef = defs.get(defs.size() - 1); before = lastDef.getNextSibling(); } else { before = this.getNextSibling(); } if (before == null) { // Is expected to assertWritable(); parent.appendChild(def); } else { // Is expected to assertWritable(); parent.insertBefore(def, before); } } else { assertWritableOnDocument(); defs.add(def); } }