code: public Content getTargetPackageLink(PackageElement pkg, String target,
              Content label) {
          return getHyperLink(pathString(pkg, DocPaths.PACKAGE_SUMMARY), label, "", target);
      }
docs: Get Package link, with target frame.
  
  @param pkg The link will be to the "package-summary.html" page for this package
  @param target name of the target frame
  @param label tag for the link
  @return a content for the target package link