docs: public static XMLGrammarPool getGrammarPool() {
          XMLGrammarPool pool = grammarPool.get();
          if (pool == null) {
              try {
                  pool = new XMLGrammarPoolImplUtils();
                  grammarPool.set(pool);
              } catch (final Exception e) {
                  System.out.println("Failed to create Xerces grammar pool for caching DTDs and schemas");
              }
          }
          return pool;
      }