code: public static String getDomainPackageName() {
          String domainPackageName = getMetaDataString(METADATA_DOMAIN_PACKAGE_NAME);
  
          if (domainPackageName == null) {
              domainPackageName = "";
          }
  
          return domainPackageName;
      }
docs: Grabs the domain name of the model classes from the manifest.
  
  @return the package String that Sugar uses to search for model classes