code: protected String getConfigurationPackage() {
          Package pkg = getClass().getPackage();
          return pkg != null ? pkg.getName() : "";
      }
docs: <p>Get the name of the package for which the current
  module is responsible.
  
  <p>The name of the package is used to determine
  which c10n interfaces this configuration is
  responsible for
  
  <p>The default implementation, which returns
  the string representation of the package of
  the configuration class, should suffice in most
  cases
  
  @return name of package the current module is responsible for