public void writeExternal(Element parentNode) throws WriteExternalException {
    DefaultJDOMExternalizer.writeExternal(this, parentNode);
    for (final AntBuildFileBase buildFile : AntConfiguration.getInstance(myProject).getBuildFileList()) {
      Element element = new Element(BUILD_FILE);
      element.setAttribute(URL, buildFile.getVirtualFile().getUrl());
      buildFile.writeWorkspaceProperties(element);
      parentNode.addContent(element);
    }
  }
public void writeExternal(Element parentNode)