/** @defgroup group1 The First Group

 *  This is the first group

 *  @{

 */

/** @brief class C1 in group 1 */

class C1 {};

/** @brief class C2 in group 1 */

class C2 {};

/** function in group 1 */

void func() {}

/** @} */ // end of group1

/**

 *  @defgroup group2 The Second Group

 *  This is the second group

 */

/** @defgroup group3 The Third Group

 *  This is the third group

 */

/** @defgroup group4 The Fourth Group

 *  @ingroup group3

 *  Group 4 is a subgroup of group 3

 */

/**

 *  @ingroup group2

 *  @brief class C3 in group 2

 */

class C3 {};

/** @ingroup group2

 *  @brief class C4 in group 2

 */

class C4 {};

/** @ingroup group3

 *  @brief class C5 in @link group3 the third group@endlink.

 */

class C5 {};

/** @ingroup group1 group2 group3 group4

 *  namespace N1 is in four groups

 *  @sa @link group1 The first group@endlink, group2, group3, group4 

 *

 *  Also see @ref mypage2

 */

namespace N1 {};

/** @file

 *  @ingroup group3

 *  @brief this file in group 3

 */

/** @defgroup group5 The Fifth Group

 *  This is the fifth group

 *  @{

 */

/** @page mypage1 This is a section in group 5

 *  Text of the first section

 */

/** @page mypage2 This is another section in group 5

 *  Text of the second section

 */

/** @} */ // end of group5

/** @addtogroup group1

 *  

 *  More documentation for the first group.

 *  @{

 */

/** another function in group 1 */

void func2() {}

/** yet another function in group 1 */

void func3() {}

/** @} */ // end of group1