code: public String getWikipediaId() {
          StringBuilder sb = new StringBuilder();
          sb.append(this.getDatabaseConfiguration().getHost());
          sb.append("_");
          sb.append(this.getDatabaseConfiguration().getDatabase());
          sb.append("_");
          sb.append(this.getDatabaseConfiguration().getLanguage());
          return sb.toString();
      }
docs: The ID consists of the host, the database, and the language.
  This should be unique in most cases.
  @return Returns a unique ID for this Wikipedia object.