code: public void buildPackageSerializedForm(XMLNode node, Content serializedSummariesTree) throws DocletException {
          Content packageSerializedTree = writer.getPackageSerializedHeader();
          SortedSet<TypeElement> classes = utils.getAllClassesUnfiltered(currentPackage);
          if (classes.isEmpty()) {
              return;
          }
          if (!serialInclude(utils, currentPackage)) {
              return;
          }
          if (!serialClassFoundToDocument(classes)) {
              return;
          }
          buildChildren(node, packageSerializedTree);
          writer.addPackageSerializedTree(serializedSummariesTree, packageSerializedTree);
      }
docs: Build the package serialized form for the current package being processed.
  
  @param node the XML element that specifies which components to document
  @param serializedSummariesTree content tree to which the documentation will be added
  @throws DocletException if there is a problem while building the documentation