code: protected ArrayList<String> getClassKeyword(ClassDoc classdoc) {
          String cltypelower = classdoc.isInterface() ? "interface" : "class";
          ArrayList<String> metakeywords = new ArrayList<String>(1);
          metakeywords.add(classdoc.qualifiedName() + " " + cltypelower);
          return metakeywords;
      }
docs: Get the current class for a meta tag keyword, as the first
  and only element of an array list.