// set the indentation for the next element
element.setIndentation(whitespaces, indent + indentCount, indentCount);
// Creating an SMOutputElement to be sure that the previous nested element tag is closed properly.
SMNamespace sbmlSMNamespace = element.getNamespace();
SMOutputElement messageElement = element.addElement(sbmlSMNamespace, "message");
messageElement.setIndentation(createIndentationString(indent + 2), indent + indentCount, indentCount);
writer.writeCharacters(whitespaces);
writer.writeCharacters("\n");
XMLNodeWriter xmlNodeWriter = new XMLNodeWriter(writer,