code: @Override
      public ListXssMatchSetsResult listXssMatchSets(ListXssMatchSetsRequest request) {
          request = beforeClientExecution(request);
          return executeListXssMatchSets(request);
      }
docs: <p>
  Returns an array of <a>XssMatchSet</a> objects.
  </p>
  
  @param listXssMatchSetsRequest
  A request to list the <a>XssMatchSet</a> objects created by the current AWS account.
  @return Result of the ListXssMatchSets operation returned by the service.
  @throws WAFInternalErrorException
  The operation failed because of a system problem, even though the request was valid. Retry your request.
  @throws WAFInvalidAccountException
  The operation failed because you tried to create, update, or delete an object by using an invalid account
  identifier.
  @sample AWSWAFRegional.ListXssMatchSets
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/waf-regional-2016-11-28/ListXssMatchSets" target="_top">AWS
  API Documentation</a>