code: private RepositoryResource getNonProductResourceWithHigherVersion(RepositoryResource res1, RepositoryResource res2) {
  
          if (res1.getVersion() == null || res2.getVersion() == null) {
              return res1; // don't have two versions so can't compare
          }
  
          // have two String versions .. convert them into Version objects,checking that they are valid versions in the process
          Version4Digit res1Version = null;
          Version4Digit res2Version = null;
          try {
              res1Version = new Version4Digit(res1.getVersion());
              res2Version = new Version4Digit(res2.getVersion());
          } catch (IllegalArgumentException iae) {
              // at least one of the one or more of Versions is not a proper osgi
              // version so we cannot compare the version fields.  Just return res1.
              return res1;
          }
  
          if (res1Version.compareTo(res2Version) > 0) {
              return res1;
          } else {
              return res2;
          }
      }
docs: Return the resource with the highest version for when the appliesTo versions are equal
  
  @param res1 resource to compare
  @param res2 resource to compare
  @return RepositoryResource with the higher version field