code: public DescribeRulesPackagesResult withRulesPackages(RulesPackage... rulesPackages) {
          if (this.rulesPackages == null) {
              setRulesPackages(new java.util.ArrayList<RulesPackage>(rulesPackages.length));
          }
          for (RulesPackage ele : rulesPackages) {
              this.rulesPackages.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the rules package.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setRulesPackages(java.util.Collection)} or {@link #withRulesPackages(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param rulesPackages
  Information about the rules package.
  @return Returns a reference to this object so that method calls can be chained together.