public void addPackageClass(PackageClass pClass) {

    Document doc;
    try {
      doc = getDocument();
    } catch (Exception e) {
      e.printStackTrace();
      return;
    }

    String name = pClass.getName();

    // check if such class exists and remove duplicates
    Element rootEl = doc.getDocumentElement();
    NodeList classEls = rootEl.getElementsByTagName(EL_CLASS);
    for (int i = 0; i < classEls.getLength(); i++) {
      Element nameEl = getElementByName((Element) classEls.item(i), EL_NAME);
      if (name.equals(nameEl.getTextContent())) {
        rootEl.removeChild(classEls.item(i));
      }
    }

    Element classNode = doc.createElement(EL_CLASS);
    doc.getDocumentElement().appendChild(classNode);
    classNode.setAttribute(ATR_TYPE, PackageClass.ComponentType.SCHEME.getXmlName());
    classNode.setAttribute(ATR_STATIC, "false");

    Element className = doc.createElement(EL_NAME);
    className.setTextContent(name);
    classNode.appendChild(className);

    Element desrc = doc.createElement(EL_DESCRIPTION);
    desrc.setTextContent(pClass.getDescription());
    classNode.appendChild(desrc);

    Element icon = doc.createElement(EL_ICON);
    icon.setTextContent(pClass.getIcon());
    classNode.appendChild(icon);

    // graphics
    classNode.appendChild(generateGraphicsNode(doc, pClass.getGraphics()));

    // ports
    List<Port> ports = pClass.getPorts();
    if (!ports.isEmpty()) {
      Element portsEl = doc.createElement(EL_PORTS);
      classNode.appendChild(portsEl);

      for (Port port : ports) {
        portsEl.appendChild(generatePortNode(doc, port));
      }
    }

    // fields
    Collection<ClassField> fields = pClass.getFields();
    if (!fields.isEmpty()) {
      Element fieldsEl = doc.createElement(EL_FIELDS);
      classNode.appendChild(fieldsEl);

      for (ClassField cf : fields) {
        fieldsEl.appendChild(generateFieldNode(doc, cf));
      }
    }

    // write
    try {
      writeDocument(doc, new FileOutputStream(xmlFile));
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
  }