public boolean isMember(String groupId,String memberId) throws AppsForYourDomainException, MalformedURLException, IOException, ServiceException {
  return doesEntityExist(groupId + "/member/" + memberId);
}

public boolean isMember ( String groupId , String memberId ) throws AppsForYourDomainException , MalformedURLException , IOException , ServiceException { return doesEntityExist ( groupId + "/member/" + memberId ) ; }
checks if an user / group is a member of the group specified .
