code: public ExtendedSwidProcessor setKeywords(final String... keywordList) {
          KeywordsComplexType kct = new KeywordsComplexType();
          if (keywordList.length > 0) {
              for (String keyword : keywordList) {
                  kct.getKeyword().add(new Token(keyword, idGenerator.nextId()));
              }
          }
          swidTag.setKeywords(kct);
          return this;
      }
docs: Defines product keywords (tag: keywords).
  
  @param keywordList
  product keywords
  @return a reference to this object.