docs: private List<PackageDescr> getPackageDescrs(Resource resource) throws DroolsParserException, IOException {
          List<PMMLResource> resources = pmmlCompiler.precompile(resource.getInputStream(), null, null);
          if (resources != null && !resources.isEmpty()) {
              return generatedResourcesToPackageDescr(resource, resources);
          }
          return null;
      }